Gaya APA
WALKER, J, C.
(1969).
Plant pathology
(
3rd. ed.)
.
New Delhi:
Tata Mc graw-hil Publ. Co. ltd.
Gaya MLA
WALKER, John, Charles.
"Plant pathology".
3rd. ed.
New Delhi:
Tata Mc graw-hil Publ. Co. ltd,
1969.
Buku.