Παραπομπή σε μορφή APA (7η εκδ.)

Gray, J., & Dahmen, D. (1977). Market potential for Wisconsin's attraction and campgrounds (2nd ed.). Recreation Resources Ceter.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gray, Jack, και Dave Dahmen. Market Potential for Wisconsin's Attraction and Campgrounds. 2nd ed. Madison, Wisc: Recreation Resources Ceter, 1977.

Παραπομπή σε μορφή MLA (9th εκδ.)

Gray, Jack, και Dave Dahmen. Market Potential for Wisconsin's Attraction and Campgrounds. 2nd ed. Recreation Resources Ceter, 1977.