Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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