W. Allan Johnson, “P.RAMLEE BARBERSHOP QUARTETS: INTRODUCING AN AMERICAN STYLE OF SINGING THROUGH MALAYSIAN CULTURE”, JCIT, vol. 6, pp. 93–101, Sep. 2016, Accessed: Dec. 06, 2025. [Online]. Available: https://ejournal.upsi.edu.my/index.php/JCIT/article/view/1069