Παραπομπή σε μορφή APA (7η εκδ.)

United States Agency for International Development, International Conference on Sustainable Agricultural Systems, & Edwards, C. A. (1990). Sustainable agricultural systems. Soil and Water Conservation Society.

Παραπομπή σε μορφή Chicago (17η εκδ.)

United States Agency for International Development, International Conference on Sustainable Agricultural Systems, και C. A. Edwards. Sustainable Agricultural Systems. Ankeny, Iowa: Soil and Water Conservation Society, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

United States Agency for International Development, et al. Sustainable Agricultural Systems. Soil and Water Conservation Society, 1990.