APA (7th ed.) Citation

Ronald, J. A. W., David, K. C., & Ronald, E. G. (1986). World directory of map collections. K.G. Saur Munchen.

Chicago Style (17th ed.) Citation

Ronald, John A. Wolter, K. Carrington David, and E. Grime Ronald. World Directory of Map Collections. New York: K.G. Saur Munchen, 1986.

MLA (9th ed.) Citation

Ronald, John A. Wolter, et al. World Directory of Map Collections. K.G. Saur Munchen, 1986.