Wingfield, B., & Berry, J. (2002). Mempertahankan karyawan unggul. PPM.
Chicago Style (17th ed.) CitationWingfield, Barb, and Janice Berry. Mempertahankan Karyawan Unggul. PPM, 2002.
MLA (8th ed.) CitationWingfield, Barb, and Janice Berry. Mempertahankan Karyawan Unggul. PPM, 2002.
Warning: These citations may not always be 100% accurate.