University of the Philippines Diliman. National Institute for Science and Mathematics. High School Mathematics Group Writing Team. (2001). Sourcebook on practical work for teacher trainers: High school mathematics I and II, vol. 2. SMEMDP.
Cita Chicago (17th ed.)University of the Philippines Diliman. National Institute for Science and Mathematics. High School Mathematics Group Writing Team. Sourcebook on Practical Work for Teacher Trainers: High School Mathematics I and II, Vol. 2. Diliman, Quezon City: SMEMDP, 2001.
Cita MLA (9th ed.)University of the Philippines Diliman. National Institute for Science and Mathematics. High School Mathematics Group Writing Team. Sourcebook on Practical Work for Teacher Trainers: High School Mathematics I and II, Vol. 2. SMEMDP, 2001.