APA-viite (7. p.)

Engelken, R., Engelken, R., & Slattery, P. (1981). The art of natural farming & gardening. Barrington Hall Press.

Chicago-viite (17. p.)

Engelken, Ralph, Rita Engelken, ja Pat Slattery. The Art of Natural Farming & Gardening. Greeley, Iowa: Barrington Hall Press, 1981.

MLA-viite (8. p.)

Engelken, Ralph, et al. The Art of Natural Farming & Gardening. Barrington Hall Press, 1981.