APA (7th ed.) Citation

Tan, C. (2001). Congruence subgroups of the modular group.

Chicago Style (17th ed.) Citation

Tan, Candy. Congruence Subgroups of the Modular Group. 2001.

MLA (8th ed.) Citation

Tan, Candy. Congruence Subgroups of the Modular Group. 2001.

Warning: These citations may not always be 100% accurate.