Παραπομπή APA

Wahl, E. F. (1977). Geometrical energy utilization. John - Wiley.

Παραπομπή Chicago Style

Wahl, Edward F. Geometrical Energy Utilization. New York: John - Wiley, 1977.

Παραπομπή MLA

Wahl, Edward F. Geometrical Energy Utilization. John - Wiley, 1977.