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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিInternational Conference on Conceptual Modeling :Singapour, Tok Wang Ling, Sudha Ram, এবং Mong Li Lee. Conceptual Modeling ER 98: 17th International Conference on Conceptual Modeling, Singapore, November 16-19, 1998 : Proceedings. Berlin [etc.]: Springer.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিInternational Conference on Conceptual Modeling :Singapour, et al. Conceptual Modeling ER 98: 17th International Conference on Conceptual Modeling, Singapore, November 16-19, 1998 : Proceedings. Springer.
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