Gaya APA
Planck, U.
(1990).
Sosiologi Pertanian
.
Jakarta:
Yayasan Obor Indonesia.
Gaya MLA
Planck, Ulrich.
"Sosiologi Pertanian".
Jakarta:
Yayasan Obor Indonesia,
1990.
23cm.,,338.7 Spa H c.1,English.