Παραπομπή APA

W.Wesley Eckenfelder. (1981). Sludge Treatment. Marcel Dekker,inc.

Παραπομπή Chicago Style

W.Wesley Eckenfelder. Sludge Treatment. Marcel Dekker,inc, 1981.

Παραπομπή MLA

W.Wesley Eckenfelder. Sludge Treatment. Marcel Dekker,inc, 1981.