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ADI, OKTAVIANTO (2019) SOFTWARE VERSION CONTROL. POLITEKNIK ILMU PELAYARAN SEMARANG, SEMARANG. ISBN 978-623-7445-03-6
ADI, OKTAVIANTO (2019) LEADERSHIP AND TEAMWORK SKILL. POLITEKNIK ILMU PELAYARAN SEMARANG, SEMARANG. ISBN 978-602-5694-99-8 ; e-ISBN : 978-602-5694-99-8