Gaya APA
M., S, M., LT., W. (1980).
Agricultue, Economics, and Resource Management (Edisi Dua).
Englewood:
Prentice-Hall Inc.
Gaya MLA
M., Snodgrass, Milton., LT., Wallace.
"Agricultue, Economics, and Resource Management".
Edisi Dua
Englewood:
Prentice-Hall Inc,
1980.
Text.