Bard Houtkamp, Alex Spilker, Joop Stolk.

MLA

Houtkamp, Bard, Alex Spilker, and Joop Stolk. Bard Houtkamp, Alex Spilker, Joop Stolk. Utrecht: 't Hoogt, 1980.

APA

Houtkamp, B., Spilker, A., & Stolk, J. (1980). Bard Houtkamp, Alex Spilker, Joop Stolk. Utrecht: 't Hoogt.

Chicago

Houtkamp, Bard, Alex Spilker, and Joop Stolk. Bard Houtkamp, Alex Spilker, Joop Stolk. Utrecht: 't Hoogt, 1980.