Gaya APA
Blaikie, P. (1992).
The Political Economy of Soil Erosion in Developing Countries (pertama).
USA:
Longman Scientific & Technical.
Gaya MLA
Blaikie, Piers.
"The Political Economy of Soil Erosion in Developing Countries".
pertama
USA:
Longman Scientific & Technical,
1992.
Teksbook.