Levin, Richard I.
Quantitative approaches to management
McGraw-Hill, 1986
 Buku Teks
Levin, Richard I.
Quantitative approaches to management
New York, NY, McGraw-Hill
 Buku Teks
Levin, Richard I.
Quantitative Approaches to Management
McGraw-Hill International, c1982
 Buku Teks
Biosecurity surveillance: quantitative approaches
Frith Jarrad, Samantha Low-Choy and Kerrie Mengersen, editors
CABI, 2015
 Buku Teks
Creswell, John W.
Research design : qualitative, quantitative, approaches
Sage, 1994
 Buku Teks SO