Gaya APA

Gershuny, G., Smillie, J. (1999). The soul of soil: a soil-building guide for master gardeners and farmers (Fourth). United States: Chelea Green Publishing.

Gaya MLA

Gershuny, Grace., Smillie, Joe. "The soul of soil: a soil-building guide for master gardeners and farmers". Fourth United States: Chelea Green Publishing, 1999. Text.