APA

Dumas A., Ball G. & Bell F. (2007). The Black Tulip. Cairo: Macmillan Egypt.

Chicago

Dumas Alexandre, Ball Gerry and Bell Florence. 2007. The Black Tulip. Cairo: Macmillan Egypt.

Harvard

Dumas A., Ball G. and Bell F. (2007). The Black Tulip. Cairo: Macmillan Egypt.

MLA

Dumas Alexandre, Ball Gerry and Bell Florence. The Black Tulip. Cairo: Macmillan Egypt. 2007.