Gaya APA
Butler, B.E.. (1980).
Soil Classification for Soil Survey .
:
Clarendon Press.
Gaya Chicago
Butler, B.E..
Soil Classification for Soil Survey.
:
Clarendon Press,
1980.
Text.
Gaya MLA
Butler, B.E..
Soil Classification for Soil Survey.
:
Clarendon Press,
1980.
Text.
Gaya Turabian
Butler, B.E..
Soil Classification for Soil Survey.
:
Clarendon Press,
1980.
Print.