Gaya APA
Frey, D. (2011).
Bioshelter Market Garden: A Permaculture Farm (Edisi Pertama).
Canada:
New Society Publishers.
Gaya MLA
Frey, Darrell.
"Bioshelter Market Garden: A Permaculture Farm".
Edisi Pertama
Canada:
New Society Publishers,
2011.
Text.