Gaya APA

al., E. et al (1981). Principles And Procedures Of Statistics (a Biometrical Approach) (Ed. 2). New Delhi: McGraw-Hill Book Company.

Gaya MLA

al., Et. et al. "Principles And Procedures Of Statistics (a Biometrical Approach)". Ed. 2 New Delhi: McGraw-Hill Book Company, 1981. Text.