Cita APA (7th ed.)

Krul, W. F. J. M. (1964). Selected topics in sanitary engineering. Uitgeverij Waltman.

Cita Chicago (17th ed.)

Krul, Wilhelmus Franciscus Johannes Marie. Selected Topics in Sanitary Engineering. Delft: Uitgeverij Waltman, 1964.

Cita MLA (8th ed.)

Krul, Wilhelmus Franciscus Johannes Marie. Selected Topics in Sanitary Engineering. Uitgeverij Waltman, 1964.