Siagian. (1998). Manajemen abad 21. Bumi Aksara.
Chicago Style (17th ed.) CitationSiagian. Manajemen Abad 21. Bumi Aksara, 1998.
MLA (8th ed.) CitationSiagian. Manajemen Abad 21. Bumi Aksara, 1998.
Warning: These citations may not always be 100% accurate.