Velasquez, C. C., & Asis, C. V. (1993). Modern biology (Philippine version): With biology investigations (Revised edition.). National Book Store, Inc.
Chicago-viite (17. p.)Velasquez, Carmen Camacho, ja Consuelo Villamor Asis. Modern Biology (Philippine Version): With Biology Investigations. Revised edition. [Mandaluyong City, Metro Manila]: National Book Store, Inc, 1993.
MLA-viite (9. p.)Velasquez, Carmen Camacho, ja Consuelo Villamor Asis. Modern Biology (Philippine Version): With Biology Investigations. Revised edition. National Book Store, Inc, 1993.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.