Penggayaan APA
KIRKBY, M.J.. (1980).
Soil erosion .
New York:
John Wiley and sons.
Chicago Style
KIRKBY, M.J..
Soil erosion.
New York:
John Wiley and sons,
1980.
Buku.
MLA Style
KIRKBY, M.J..
Soil erosion.
New York:
John Wiley and sons,
1980.
Buku.
Turabian Style
KIRKBY, M.J..
Soil erosion.
New York:
John Wiley and sons,
1980.
Buku.