APA (7th ed.) Citation

De Groot, J., & de Groot, J. (1978). Kerman in the late nineteenth century.

Chicago Style (17th ed.) Citation

De Groot, J., and Joanna de Groot. Kerman in the Late Nineteenth Century. 1978.

MLA (9th ed.) Citation

De Groot, J., and Joanna de Groot. Kerman in the Late Nineteenth Century. 1978.