Hamzah, Muhammad Sodbir and Abdullah, Hussin (2013) Effect of English proficiency on social capital and academic achievement among economic students. In: Persidangan Kebangsaan Ekonomi Malaysia ke VIII (PERKEM VIII), 7 – 9 Jun 2013, KSL Hotel & Resort, Johor Bahru, Johor, Malaysia.

Hamzah, Muhammad Sodbir and Abdullah, Hussin and Ahmad, Mazida (2015) Effect of English proficiency on social capital and academic achievement among economic students. International Journal of Business and Society, 16 (3). pp. 453-469. ISSN 1511-6670