abdul shukor, fatin syazwina, and abdul hakim mohammed. “Measurement Model Assessment of Intervention Strategies for Littering Behavior Changes Using Partial Least Square: In Context of Malaysian Flat Residents”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 16, no. 1, May 2014, pp. 154-6, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/2290.