APA (7th ed.) Zitazioa

National Science Teachers Association & ebrary, Inc. (2001). Dig in!: Hands-on soil investigations. NSTA Press.

Chicago Style (17th ed.) Zitazioa

National Science Teachers Association eta Inc ebrary. Dig in!: Hands-on Soil Investigations. Arlington, Va.: NSTA Press, 2001.

MLA (9th ed.) Zitazioa

National Science Teachers Association eta Inc ebrary. Dig in!: Hands-on Soil Investigations. NSTA Press, 2001.