APA استشهاد

SCHOPFER W.H, N.. (1949). PLANTS AND VITAMINS. CHRONIC BOTANIC CO.

استشهاد بنمط شيكاغو

SCHOPFER W.H, NOECKER,Norbert.L. PLANTS AND VITAMINS. USA: CHRONIC BOTANIC CO, 1949.

MLA استشهاد

SCHOPFER W.H, NOECKER,Norbert.L. PLANTS AND VITAMINS. CHRONIC BOTANIC CO, 1949.