Amir Abadi Jusuf
Salemba Empat, 1984
Buku Teks
Cerepak, John R., author
Prentice-Hall, 1987
Buku Teks
Niswonger, C. Rollin (Clifford Rollin), 1907-, author
South-Western Pub., Co. , 1977
Buku Teks
Stevenson, Russell A., author
Alexander Hamilton Institute, 1962
Buku Teks
Hosch, Gordon A., author
Prentice-Hall, 1979
Buku Teks