APA
Dr. Leticia P. Cortes, . (1994). Integrated Science. Makati Metro, Manila: Diwa Learning Systems,Inc.
Chicago
Dr. Leticia P. Cortes, . 1994. Integrated Science. Makati Metro, Manila: Diwa Learning Systems,Inc.
Harvard
Dr. Leticia P. Cortes, . (1994). Integrated Science. Makati Metro, Manila: Diwa Learning Systems,Inc.
MLA
Dr. Leticia P. Cortes, . Integrated Science. Makati Metro, Manila: Diwa Learning Systems,Inc. 1994.