Book  (1935)  Page(s) 177, 189.  
 
Page 177: Baron de Bonstetten the great old maroon
Page 189: Baron de Bonstetten
Hybrid Perpetual 1871
... a velvety, very blackish crimson shading to maroon... very fragrant... shy in autumn...

Website/Catalog  (1929)  Page(s) 38.  
 
Hybrid Perpetual Roses
Baron de Bonstetten. (J. Liabaud, 1871.) Velvety maroon with blackish crimson shading, medium-sized, and very fragrant. Excellent growth and bloom, but shy in autumn. 
One of the very darkest Roses, but not at its best in hot sunshine.

Website/Catalog  (1921)  Page(s) 65.  
 
Hybrid Perpetuals....Dark red...Baron Bonstetten

Website/Catalog  (1917)  Page(s) 43.  
 
Hybrid Perpetual Roses
Baron de Bonstetten. — Large double flowers of deep velvety maroon, appearing almost black. A vigorous grower.

Website/Catalog  (1914)  Page(s) 11.  
 
Hybrid Perpetual Roses.
Baron de Bonstetten, Liabaud, 1871, very vigorous. Velvety blackish crimson, large, full. (Syn. Monsieur Boncenne).

Website/Catalog  (1913)  Page(s) 11.  
 
Hybrid Perpetual Roses.
Baron de Bonstetten
As glorious a production as can be imagined, a dark velvety crimson flower with a delightful odor. The Baron de Bonstetten Rose somewhat resembles the Prince Camille de Rohan, but is a little lighter and fuller. It flowers freely, with large, full blosooms, profuse in June. The growth is vigorous and compact and the plant is hardy. From its first introduction this variety has attracted the attention of Rose-lovers, and time does not seem to have impaired its popularity with expert Rosarians or amateur gardeners. It is one of the substantial results of expert hybridizing and the plants and beautiful flowers have become permanent features of all well-regulated Rose-gardens.

Magazine  (20 May 1911)  Page(s) 243.  
 
The Parentage of Roses.
The following list of the world's Roses and their parentage has been compiled by Mr. Robert Daniel, 38 Russell Road. Fishponds, Bristol, and by his kind permission we are enabled to publish it...
Baron de Bonstettin [sic]... H.P., Liabaud, 1871, General Jacqueminot X Geant des Batailles

Website/Catalog  (1911)  Page(s) 119.  
 
Hybrid Perpetuals...Dark red...Baron de Bonstetten

Book  (1910)  Page(s) 192, 279.  
 
Baron de Bonstetten among the best roses of 1871... ('Monsieur Boncenne') flowers red, black, and crimson, large, full, and good...

Book  (1906)  Page(s) 16.  
 
1.032. Baron de Bonstetten, Hybride Remontant, Liabaud 1871 cramoisi foncé, syn. M. Boncenne