Website/Catalog  (1949)  
 
"YATKAN - another Hansen introduction, might well be a sister of Tetonkaha. 100% hardy, large flower, pink, better than semi-double."

Percy Wright Catalogue - Hardy and Semi-Hardy Roses - ca 1949 p.5

Book  (1936)  Page(s) 765.  
 
Yatkan (hybrid arkansana) Prof. Hansen 1927; Gruss an Teplitz X La Melusine; pure pink, 6 cm., semi-double, once-blooming, growth 7/10, upright, 1 m. Sangerhausen

Book  (1927)  Page(s) 227-228.  
 
Contains a lengthy listing of Prof. Hansen's roses, including Yatkan, noting descriptions and parentage.

Book  (1927)  Page(s) 53.  
 
Yatkan Rose - Introduced 1927. Pedigree: Somewhat uncertain but very likely Gruss an Teplitz x La Melusine. Flowers semi-double, two and on-half inches across; color pure pink; blooms through July.