Gill, James O, author
PPM, 2002
Buku Teks
Gill, James O., author
PPM, 2002
Buku Teks
Brigham, Eugene F., 1930-, author
Salemba Empat, 2006
Buku Teks
Soekarno K., author
Miswar, 1986
Buku Teks
Manullang, M., author
Gajah Mada University Press, 2002
Buku Teks