2 1 50 Christopher... [et.al]; penerjemah, Sumarso Santoso; editor, Damos O.V.Y. Sihombing Pass, Christopher Additional Author Santoso, Sumarsono Additional Author Sihombing, Damos O.V.Y. Additional Author mixed material Jakarta Erlangga 1999 Christopher Pass, Bryan Lowes and Leslie Davies;Penerjemah, Tumpal Rumapea, Posman Halolo Pass, Christopher Additional Author Lowes, Bryan Additional Author Davies, Leslie Additional Author Rumapea. Tumpal Additional Author Haloho, Posman. Additional Author mixed material Jakarta Erlangga 1994