Gaya APA
Powers, Laura E. (2000).
Ecological principles of agriculture .
:
Delmar.
Gaya Chicago
Powers, Laura E.
Ecological principles of agriculture.
:
Delmar,
2000.
.
Gaya MLA
Powers, Laura E.
Ecological principles of agriculture.
:
Delmar,
2000.
.
Gaya Turabian
Powers, Laura E.
Ecological principles of agriculture.
:
Delmar,
2000.
.