Παραπομπή APA

Pierce, F. J., & Clay, D. (2007). GIS applications in agriculture. CRC Press.

Παραπομπή Chicago Style

Pierce, Francis J., και David Clay. GIS Applications in Agriculture. Boca Raton: CRC Press, 2007.

Παραπομπή MLA

Pierce, Francis J., και David Clay. GIS Applications in Agriculture. CRC Press, 2007.