APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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