National Science Teachers Association & ebrary, Inc. (2001). Dig in!: Hands-on soil investigations. NSTA Press.
Chicago Style (17th ed.) CitationNational Science Teachers Association and Inc ebrary. Dig in!: Hands-on Soil Investigations. Arlington, Va.: NSTA Press, 2001.
MLA (9th ed.) CitationNational Science Teachers Association and Inc ebrary. Dig in!: Hands-on Soil Investigations. NSTA Press, 2001.
Warning: These citations may not always be 100% accurate.