Gaya APA
PHILLIPS, R, E. (1984).
NO-TILLAGE AGREICULTURE PRINCIPLES AND PRACTICES .
LONDON, INGGRIS:
VAN NOSTRAND RENHOLD COMPANY.
Gaya MLA
PHILLIPS, RONALD, E..
"NO-TILLAGE AGREICULTURE PRINCIPLES AND PRACTICES".
LONDON, INGGRIS:
VAN NOSTRAND RENHOLD COMPANY,
1984.
Text.