Gailan, T. K. P. (1989). Descriptive statistics (Revised edition.). Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila.
Lua i Stíl Chicago (17ú heag.)Gailan, Tarlochan Kaur Pabla. Descriptive Statistics. Revised edition. Manila: Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila, 1989.
Lua MLA (9ú heag.)Gailan, Tarlochan Kaur Pabla. Descriptive Statistics. Revised edition. Learning Resources Unit, National Teacher Training Center for the Health Professions, University of the Philippines Manila, 1989.
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