Book  (1953)  Page(s) 75.  
 
Dr. A. S. Thomas.  Yellow Roses. 
Lady Plymouth, Mrs. MacKellar, Percy Izzard and Sam McGredy are all somewhat alike in their honey colour and in having perfect form... Mrs Mackellar, distributed in 1915, is still worth its place in any garden but I have tried in vain, to buy plants of it for some years. 

Book  (1936)  Page(s) 441.  
 
MacKellar, Mrs. (HT) Dickson 1915; lemon-yellow to canary-yellow, fades to mother-of-pearl-yellow to white, large, double, fine form, solitary to 3, fragrance 6/10, very floriferous, repeats well, growth 6/10, upright. Sangerhausen

Website/Catalog  (1929)  Page(s) 27.  
 
Everblooming Roses
The so-called Everblooming Roses include the Hybrid Tea and Pernetiana groups. They do not bloom all the time, but if kept healthy and growing steadily, one crop of flowers succeeds another at brief intervals.
Mrs. Mackellar. Hybrid Tea. (A. Dickson & Sons, 1915.) Delicate, light yellow, almost cream buds of perfect shape, opening to semi-double, fragrant flowers. Fair growth and bloom. Foliage excellent.
In the bud it is one of the most delightful Roses known; the open flower is pretty but ought to have more petals.

Website/Catalog  (1926)  Page(s) 105.  
 
Mrs. Mackellar (1915) (Hybride de thé). Fl. gr., pl., glob , citron foncé ou canari délicat pur. Extra !

Book  (1926)  Page(s) 49.  
 
Mrs. MacKellar (A. Dickson & Sons, 1915): delicately modeled, tapering buds, but the open flower is bad. Plant not strong, and rather tender.

Website/Catalog  (1925)  Page(s) 6.  
 
Mrs. Mac Kellar, large, double, canary-yellow, fragrant

Website/Catalog  (1924)  Page(s) 25.  
 
Mrs Mackeliar. — Fleur grande et pleine jaune citron foncé passant au blanc perle.
 

Website/Catalog  (1924)  Page(s) 39.  
 
General List. (99) Mrs. MacKellar (HT. A. Dickson 1915). F.2. .....semi-double.....When covered the colour gets much deeper. Everywhere.

Website/Catalog  (1923)  Page(s) 38.  
 
Hybrid Tea Roses .... Mrs. Mackellar (A. Dickson, 1915). Light primrose-yellow passing to white. Beautiful variety.

Magazine  (Sep 1922)  Page(s) 355.  
 
Nouveautés de 1919 Hybrides de Thé ...Variétés à recommenader pour la fleur coupée ...
MRS MAC KELLAR (Alex Dickson & Sons 1915). — Fleur à centre très proéminent, de coloris jaune citron foncé, ou jaune canari passant au blanc primevère à l'épanouissement, très grande, très odorante, pédoncule rigide. Arbuste vigoureux, érigé et d'excessive floribondité. Variété très décorative, recommandée pour la fleur coupée.