Gaya APA
MENGEL, K., KIRKBY, E, A.
(1987).
Principles of plant nutrition
(
5th.ed.)
.
Dordrechet:
Kluwer Academic.
Gaya MLA
MENGEL, Konrad., KIRKBY, Ernest, A..
"Principles of plant nutrition".
5th.ed.
Dordrechet:
Kluwer Academic,
1987.
Buku.