Cita APA

(1993). The Living soil science and sustainable agriculture with your guide, the Earthworm. Ames, Iowa: Agricultural Education and Studies Iowa State University.

Citación estilo Chicago

The Living Soil Science and Sustainable Agriculture With Your Guide, the Earthworm. Ames, Iowa: Agricultural Education and Studies Iowa State University, 1993.

Cita MLA

The Living Soil Science and Sustainable Agriculture With Your Guide, the Earthworm. Ames, Iowa: Agricultural Education and Studies Iowa State University, 1993.