Παραπομπή APA

Edwards, R. W. G. (1972). Conservation and productivity of natural waters.

Παραπομπή Chicago Style

Edwards, R W; Garrod. Conservation and Productivity of Natural Waters. Zoological Survey of London, 1972.

Παραπομπή MLA

Edwards, R W; Garrod. Conservation and Productivity of Natural Waters. 1972.