APA-referens (7:e uppl.)

Castillo, L. L. (1998). Notes in mathematics for general education: A cooperative venture of the U.P. Diliman GE Mathematics Committee ([Revised edition].). University of the Philippines, GE Committee.

Chicago-referens (17:e uppl.)

Castillo, Leticia L. Notes in Mathematics for General Education: A Cooperative Venture of the U.P. Diliman GE Mathematics Committee. [Revised edition]. Quezon City: University of the Philippines, GE Committee, 1998.

MLA-referens (9:e uppl.)

Castillo, Leticia L. Notes in Mathematics for General Education: A Cooperative Venture of the U.P. Diliman GE Mathematics Committee. [Revised edition]. University of the Philippines, GE Committee, 1998.