Gaya APA
Donhaue, R, L. (1955).
Our Soils and Their Management .
Amerika Serikat:
The Interstate Printers and Publisher Danville, Illinois.
Gaya MLA
Donhaue, Roy., L..
"Our Soils and Their Management".
Amerika Serikat:
The Interstate Printers and Publisher Danville, Illinois,
1955.
Text.