Book  (2007)  Page(s) 47.  
 
Laurie Newman. Australian bred R. gigantea hybrids. On a personal level, I have grown many of the Alister Clark hybrid roses, and would not hesitate to include many of them as descendants of R. gigantea and/or its hybrids, such as ‘Princeps’ and .....

Magazine  (2006)  Page(s) 25. Vol 28, No. 3.  
 
Peter Cox [re: ‘Australian Roses’ book Page 17.] Some are of the opinion that ‘Princeps’ is a hybrid gigantea - I am not convinced. (RH [Ross Heathcote] )

Book  (2003)  Page(s) 241.  
 
‘Princeps’ [Clark, 1942].

Website/Catalog  (2000)  Page(s) 16.  
 
Princeps. Hybrid Tea Climber, 1942. Clark, Aust. Semi-climbing. post, against a wall, arch, semi double, stamens prominent, fragrant, large flowers, recurrent. 3.3m x 2.3m medium red.

Book  (1999)  Page(s) 17.  Includes photo(s).
 
‘Princeps’ - 1942. Unknown breeding. Large Flowered Climbing or Pillar rose. Semi-single, large, mid red flowers shaded deeper, golden stamens, can be recurrent. Smooth, mid green foliage. Many prickles. Flower: 10 to 18 petals. 110mm, 1 to 3, Climber or Pillar. 3.5m x 2.5m.

Magazine  (1999)  Page(s) 68. Vol 21, No. 1.  
 
Jennifer Smyth. Victorian State Rose Garden. In the Heritage border are Princeps and …..

Magazine  (1999)  Page(s) 45. Vol 21, No. 2.  
 
Trevor Nottle [reviewing Peter Cox’s Australian Roses book]
I am inspired by Peter Cox’s fine book to plant one more rose. I think it will be Alister Clark’s Princeps a single scarlet climber introduced in 1942.

Book  (Dec 1998)  Page(s) 484.  Includes photo(s).
 
‘Princeps’. Modern, large-Flowered climber, medium red. This climbing rose bears its very large red flowers throughout summer. They have only a slight fragrance. It is most suitable for growing on pillars and low fences. Zones 4-9. Clark, Australia, 1942. Parentage unknown.

Website/Catalog  (1998)  Page(s) 18.  
 
Princeps. Hybrid Tea climber. 1942. A. Clark, Aust. Semi-climbing, semi-double, stamens prominent, fragrant, recurrent, 3.3m x 2.3m medium red. .

Website/Catalog  (1997)  Page(s) 30.  
 
Princeps. Climber, 1942. Fragrant, semi-double blooms of deep red. Vigorous.