Sitorus, E. T. (1981). Analisa Matematika Ekonomi jilid 2. Saint Joseph's University.
Chicago Style (17th ed.) CitationSitorus, Ec. T. Analisa Matematika Ekonomi Jilid 2. Saint Joseph's University, 1981.
MLA (8th ed.) CitationSitorus, Ec. T. Analisa Matematika Ekonomi Jilid 2. Saint Joseph's University, 1981.
Warning: These citations may not always be 100% accurate.