Wasata Jati, P.T. (1980). Feasibility study/project proposal pengembangan Perkebunan "Lalow-Lolak". Wasata Jati.
Chicago-viite (17. p.)Wasata Jati, P.T. Feasibility Study/project Proposal Pengembangan Perkebunan "Lalow-Lolak". Manado: Wasata Jati, 1980.
MLA-viite (8. p.)Wasata Jati, P.T. Feasibility Study/project Proposal Pengembangan Perkebunan "Lalow-Lolak". Wasata Jati, 1980.
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