Cangül, İ. N. 1995. Normal Subgroups of the Hecke Groups and Regular Maps. Hacettepe Bull. of Nat. Sci. and Eng., , vol.24 , 15-23.

Cangül, İ. N., (1995). Normal Subgroups of the Hecke Groups and Regular Maps. Hacettepe Bull. of Nat. Sci. and Eng., , vol.24, 15-23.

Cangül, İSMAİL. "Normal Subgroups of the Hecke Groups and Regular Maps," Hacettepe Bull. of Nat. Sci. and Eng., , vol.24, 15-23, 1995

Cangül, İSMAİL N. . "Normal Subgroups of the Hecke Groups and Regular Maps." Hacettepe Bull. of Nat. Sci. and Eng., , vol.24, pp.15-23, 1995

Cangül, İ. N. (1995) . "Normal Subgroups of the Hecke Groups and Regular Maps." Hacettepe Bull. of Nat. Sci. and Eng., , vol.24, pp.15-23.

@article{article, author={İSMAİL NACİ CANGÜL}, title={Normal Subgroups of the Hecke Groups and Regular Maps}, journal={Hacettepe Bull. of Nat. Sci. and Eng., }, year=1995, pages={15-23} }