APA (7th ed.) Citation

Oosterhuis, H. (1980). The Children of the Poor Man. The Risk book series.

Chicago Style (17th ed.) Citation

Oosterhuis, Huub. "The Children of the Poor Man." The Risk Book Series 1980.

MLA (8th ed.) Citation

Oosterhuis, Huub. "The Children of the Poor Man." The Risk Book Series, 1980.

Warning: These citations may not always be 100% accurate.