Gaya APA
Long, R, W., Norstog, K. (1976).
Plant Biology : A laboratory Manual for Elementary Botany .
Philadelphia:
W.B. Saunders Company.
Gaya MLA
Long, Robert, W.., Norstog, Knut.
"Plant Biology : A laboratory Manual for Elementary Botany".
Philadelphia:
W.B. Saunders Company,
1976.
Text.