APA (7th ed.) Citation

Felix, R. P., & Sales, R. E. R. (1999). Origami and crystallography. Matimya's Matematika.

Chicago Style (17th ed.) Citation

Felix, Rene P., and Reamar Eileen R. Sales. "Origami and Crystallography." Matimya's Matematika 1999.

MLA (9th ed.) Citation

Felix, Rene P., and Reamar Eileen R. Sales. "Origami and Crystallography." Matimya's Matematika, 1999.

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