Service, N. R. C. (2001). Dig in!: Hands-On Soil Investigations. National Science Teachers Association (NSTA).
Style de citation Chicago (17e éd.)Service, Natural Resources Conservation. Dig in!: Hands-On Soil Investigations. Arlington: National Science Teachers Association (NSTA), 2001.
Style de citation MLA (8e éd.)Service, Natural Resources Conservation. Dig in!: Hands-On Soil Investigations. National Science Teachers Association (NSTA), 2001.
Attention : ces citations peuvent ne pas être correctes à 100%.