4 1 10 Layukallo, Thombi Primary Author Potter, Merle C Primary Author Somerton, Primary Author mixed material Jakarta Erlangga 2012 Layukallo, Thombi Primary Author Potter Primary Author Somerton, Craig W. Primary Author mixed material 8780759039 Jakarta Erlangga 2012 Layukallo, Thombi Primary Author Lipson, Marc Primary Author Lipshcutz, Seymour Primary Author mixed material 9790750920 Jakarta Erlangga 2007 Sissom, Leighton E. Primary Author Pitts, Donald R. Primary Author Layukallo, Thombi Primary Author mixed material Jakarta Erlangga 2011 img853.jpg.jpg