4 1 10 Estes, Ralph Primary Author Sinaga, Marianus Primary Author Widjajanto, Nugroho Primary Author mixed material 54030380 Jakarta Erlangga 1985 WhatsApp_Image_2021-12-14_at_15.46.16.jpeg.jpeg Horne, James C Primary Author Sinaga, Marianus Translator mixed material Jakarta Erlangga 1994 WhatsApp_Image_2022-01-07_at_15.21.50.jpeg.jpeg Fess, Philip E Primary Author Niswonger, C. Rollin Primary Author Warren, Carl S Primary Author Sinaga, Marianus Editor mixed material Jakarta Erlangga 1988 533.jpg.jpg Sinaga, Marianus Primary Author Sembiring, Nirwan Primary Author Sitorus, osman Primary Author Rusmanto,Endar Primary Author Suwandi, Darmawan Primary Author Ritonga, M.T Primary Author mixed material 04020830 Jakarta Erlangga 1994 WhatsApp_Image_2021-12-14_at_16.02.30.jpeg.jpeg