Book  (1936)  Page(s) 75.  
 
Bettelstudent (Pol) Lambert 1909; Euphrosyne X Sunset; deep carmine, white center and base, 3-4cm, single, in clusters of 3-10, floriferous, 40cm, bushy, upright

Website/Catalog  (1914)  Page(s) 35.  
 
Polyantha Pompons (Bedding Types).
No pruning necessary except to remove the past season's flower stems.
Bettelstudent... P. Lambert, 1910, robust. Rich carmine-red, running to white at base of petals; robust, erect and free-flowering; flowers single.

Website/Catalog  (1914)  Page(s) 10.  
 
Polyantha Bettelstudent Lambert. Single, dark carmine-red, passing to pure white in the centre, floriferous, hardy

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...
Bettelstudent... P[erpetual]. P[ompon].*, Lambert, 1909, Euphrosyne X Seedling Sunset

*i.e., dwarf Polyantha

Magazine  (Oct 1909)  Page(s) 94.  
 
Neuste Rosen für 1909. (Die Beschreibungen sind die der Züchter.)
Züchter: P. Lambert, Trier.
Polyantha-Rosen.
Bettelstudent. Strauch 36-50 cm hoch, buschig, aufrecht, Blume einfach, 3-4 cm Durchmesser, dunkel karminrot, nach der Mitte der Petalen bis zum Grund in reinweiss übergehend, zu 3-9 zieml. egal auf jedem Triebe, reichblühend, hart. (Euphrosyne x Sämling von Sunset)