APA (7th ed.) Citation

Elfaki, F. A. M., Hadi, A. E., & Usman, M. (2013). Statistics for solving environmental problems.

Chicago Style (17th ed.) Citation

Elfaki, Faiz Ahmed Mohamed, Agung Efriyo Hadi, and Mustofa Usman. Statistics for Solving Environmental Problems. 2013.

MLA (8th ed.) Citation

Elfaki, Faiz Ahmed Mohamed, et al. Statistics for Solving Environmental Problems. 2013.