Παραπομπή σε μορφή APA (7η εκδ.)

Ondra, N. J. (1998). Soil and composting: The complete guide to building healthy, fertile soil. Houghton Mifflin.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Ondra, Nancy J. Soil and Composting: The Complete Guide to Building Healthy, Fertile Soil. Boston: Houghton Mifflin, 1998.

Παραπομπή σε μορφή MLA (9th εκδ.)

Ondra, Nancy J. Soil and Composting: The Complete Guide to Building Healthy, Fertile Soil. Houghton Mifflin, 1998.