2 1 50 Loren R. Anderson Additional Author Fred W. Kiefer Additional Author Irving S. Dunn (diterj. oleh Achmad Toekiman) Primary Author mixed material 9798107799 Semarang Semarang : IKIP Semarang Press, 1980 1980 Irving S. Dunn Primary Author Loren R. Anderson Additional Author Fred W. Kiefer Additional Author mixed material 0417036986 New York New york : John wiley and sons, 1980 1980