1. AOAC., 1984 . Official Methods of Analysis , 14th Ed. pp.251 , 251 -428 , Association of Official Analytical Chemist, Washington, DC.
2. A. M. FARIDAH, N. N. SIK, and A. B. SHARIF, 1982 . Tanaman Durian. Risalah Pertanian Bilangan, 23 . p.1 . Jabatan Pertanian Semenanjung Malaysia, Kuala Lumpur.
3. M. GIOVANNY, 1983 . Response surface methodology and product optimization . Food Technol.Nov., 41 -45 , 41 .
4. R. G. HENIKA, 1982 . Use of response-surface methodology in sensory evaluation . Food Technol.Nov.96 -101 .