Gaya APA
HUDSON, Norman. (1981).
Soil conservation (Edisi kedua).
London, England:
Batsford Academic and Educational.
Gaya Chicago
HUDSON, Norman.
Soil conservation.
Edisi kedua
London, England:
Batsford Academic and Educational,
1981.
.
Gaya MLA
HUDSON, Norman.
Soil conservation.
Edisi kedua
London, England:
Batsford Academic and Educational,
1981.
.
Gaya Turabian
HUDSON, Norman.
Soil conservation.
Edisi kedua
London, England:
Batsford Academic and Educational,
1981.
.