APA
Gerber S. E., . (1990). Modern way of agriculture and its impact on environment. Nairobi: Tenchnopress Ltd.
Chicago
Gerber Siegfried E, . 1990. Modern way of agriculture and its impact on environment. Nairobi: Tenchnopress Ltd.
Harvard
Gerber S. E., . (1990). Modern way of agriculture and its impact on environment. Nairobi: Tenchnopress Ltd.
MLA
Gerber Siegfried E, . Modern way of agriculture and its impact on environment. Nairobi: Tenchnopress Ltd. 1990.