APA (7th ed.) Citation

Tan. (2006). What is a triangle? (2nd. ed.). Alpha Sigma.

Chicago Style (17th ed.) Citation

Tan. What Is a Triangle? 2nd. ed. Petaling Jaya: Alpha Sigma, 2006.

MLA (8th ed.) Citation

Tan. What Is a Triangle? 2nd. ed. Alpha Sigma, 2006.