Samah, Rozana, Roslina Kamaruddin, and Lim Hock Eam. 2016. “Efficiency Analysis of Pond Fish Culture System in Negeri Kedah and Pulau Pinang: Data Envelopment Analysis Approach”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 27 (1):154-66. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5669.