Referensi:
Pargament, K. I. (1996). Religious methods of coping: Resources for the conservation and transformation of significance. In E. P. Shafranske (Ed.), Religion and the clinical practice of psychology (pp. 215-239). Washington, DC, US: American Psychological Association. http://dx.doi.org/10.1037/10199-008
Russell, Bertrand. (2013). Bertuhan Tanpa Agama. Yogyakarta: Resist Book.
Syariati, Ali. (2017). Sejarah Masa Depan. Yogyakarta: Karkasa.