4 1 20 Pantur Silaban Translator WIlliam H. Hayt Primary Author Jack E. Kemmerly Additional Author mixed material Jakarta Erlangga 1988 input1_20170815_0012.jpg.jpg WIlliam H. Hayt Primary Author mixed material 9797812456 Jakarta Erlangga 2005 avii233.jpg.jpg WIlliam H. Hayt Primary Author mixed material 9797812448 Jakarta Erlangga 2005 avii231.jpg.jpg WIlliam H. Hayt Primary Author mixed material New York McGraw-Hill Companies 1981 a15agustus_20170815_0091.jpg.jpg