Gaya APA
Butler, M.D.. (1955).
Conserving soil .
:
Van Nostrand Reinhold Company.
Gaya Chicago
Butler, M.D..
Conserving soil.
:
Van Nostrand Reinhold Company,
1955.
Text.
Gaya MLA
Butler, M.D..
Conserving soil.
:
Van Nostrand Reinhold Company,
1955.
Text.
Gaya Turabian
Butler, M.D..
Conserving soil.
:
Van Nostrand Reinhold Company,
1955.
Print.