APA
School Mathematics Study Group U., .Mathematics for junior high school vol.1. Unit 7. New Delhi: National council of education research and training.
Chicago
School Mathematics Study Group U.S.A, .Mathematics for junior high school vol.1. Unit 7. New Delhi: National council of education research and training.
Harvard
School Mathematics Study Group U., .Mathematics for junior high school vol.1. Unit 7. New Delhi: National council of education research and training.
MLA
School Mathematics Study Group U.S.A, .New Delhi: National council of education research and training. .