Book  (1985)  Page(s) 166.  
 
Among my varieties some of the best known are 'Alexander', 'Compassion', 'Mountbatten', 'Yesterday', 'Elizabeth Harkness', 'Southampton' and 'Amber Queen'. 

Website/Catalog  (1982)  Page(s) 40.  
 
Yesterday (Modern Shrub) A low bushy shrub with abundant shiny leaves and graceful stems 2-4 in length, carrying sprays of tiny rose red to lavender-pink semi-double flowers. Scented and good for cutting. Nearly always in bloom. An attractive and unusual addition to the shrub roses. Harkness 1973 (C) 3 x 3‘.

Book  (1978)  Page(s) 97.  Includes photo(s).
 
'Yesterday'    Medium  Pink   Remontant   P6   H1    *** 
Elegance  can dignify Polyanthas, as this variety demonstrates, with its small, burnished leaves, and airy sprays of little flowers. The flowers are pink, and they admit in a pleasing way a suggestion of lavender as they age. 'Yesterday' is an unusual rose, apt to send up occasionally long shoots; it is particularly effective as a little hedge or as a standard. The flowering period is long, and the fragrance very sweet. The parents I  used to raise it were (Phyllis Bide' x 'Shepherd's Delight') x 'Ballerina'; my firm introduced it in 1974. I find pleasure in seeing the narrow petals open out flat around a little tuft of yellow stamens. Perhaps 'Yesterday' will lead the Polyanthas to their tomorrow

Magazine  (Feb 1977)  Page(s) 1. trimester, p. 34.  
 
Baden-Baden, Médaille d'Or, Yesteday, HT, Harkness GB

Website/Catalog  (1976)  Page(s) 26.  
 
TAPIS D'ORIENT ® (Yesterday) Nouveauté 76 Couleur surannée. Petites fleurs rose frais virant au lavande. Profusion de fleurs légères. Petit feuillage brillant. 60/80.

[no longer listed in 1977]
 

Book  (1975)  Page(s) 87.  
 
Stelvio Coggiatti, Rose Trials in Monza, Italy. 
Yesterday "Rose of the Year". Introduced by R. Harkness & Co. Ltd. (Great Britain). Very free flowering, dwarf floribunda-poly type with a well balanced growth; 15 flat petals, one inch in diameter, deep pink fading paler. Fragrant. Foliage minute and glossy.

Book  (1974)  Page(s) 69.  
 
Dr. A. S. Thomas  Roses Overseas 1973. 
Yesterday, Fl. (Harkness, 1973). [('Phyllis Bide' x 'Shepherd's Delight') x 'Ballerina'] This is classed as a floribunda (Type A  - more than seven flowers in each panicle -  by R.S.V. standards) but it may be best not to try to put it into any such category. Try to regard it as a very low shrub or edging plant with pretty little, one and a half inch semi-single (12 to 15 petals) flowers of fairly deep pink and mauve borne in well-spaced clusters. These are very pretty and easy to arrange as cut flowers. It breaks into growth again quickly after cutting. Mr. Jack Harkness is a great connoisseur of roses and he is extremely enthusiastic about 'Yesterday'. He has others like it except in colours coming along.

Book  (1973)  Page(s) 31.  
 
E. F. Allen, England.  R.N.R.S. Awards To New Rose Seedlings In 1972.
Yesterday [('Phyllis Bide' x 'Shepherd's Delight') x 'Ballerina']. An unusual floribunda, by Jack Harkness, with quite strongly scented, semi-double flowers of a pink and purple blend and conspicuous yellow stamens. It is healthy and the bush has a dwarfer and more compact habit than any of the three roses listed in its parentage.  Certificate of Merit.