Παραπομπή σε μορφή APA (7η εκδ.)

Laak, R. (1986). Wastewater engineering design for unsewered areas (2nd ed.). Technomic.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Laak, Rein. Wastewater Engineering Design for Unsewered Areas. 2nd ed. Lancaster: Technomic, 1986.

Παραπομπή σε μορφή MLA (9th εκδ.)

Laak, Rein. Wastewater Engineering Design for Unsewered Areas. 2nd ed. Technomic, 1986.