APA (7th ed.) Citation

Boonstra, J., & Ridder, N. A. d. (1981). Numerical modelling of groundwater basins: A user-oriented manual.

Chicago Style (17th ed.) Citation

Boonstra, J., and Nicolaas A. de Ridder. Numerical Modelling of Groundwater Basins: A User-oriented Manual. Wageningen, 1981.

MLA (9th ed.) Citation

Boonstra, J., and Nicolaas A. de Ridder. Numerical Modelling of Groundwater Basins: A User-oriented Manual. 1981.