APA (7th ed.) Citation

Bolkestein, G. W., & Eggink, H. (1970). Werelddelen. Wolters-Noordhoff.

Chicago Style (17th ed.) Citation

Bolkestein, G. W., and H. Eggink. Werelddelen. Groningen: Wolters-Noordhoff, 1970.

MLA (9th ed.) Citation

Bolkestein, G. W., and H. Eggink. Werelddelen. Wolters-Noordhoff, 1970.