6 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 Djojodihardjo, Harijono Primary Author mixed material Jakarta PT. GRAMEDIA 1985 Reynolds, William C. Primary Author Perkins, Henry C. Primary Author mixed material Jakarta Erlangga 1993 000018366.jpg Smith, J.M. Primary Author Van Ness, H. C. Primary Author mixed material 07Y857393 Auckland McGraw-Hill Book Company 1986 000014797.jpg Arismunandar, Winarto. Primary Author mixed material Bandung Universitas ITB bandung 1976 010002746.jpg