Rourke, John T.
Brooks/Cole, 1986
Buku Teks SO
Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Chandra, Prakash
Vikas Publishing House, 1982
Buku Teks
Miller, Lynn H.
Westview Press, 1990
Buku Teks SO
Herz, John H.
David McKay, 1976
Buku Teks SO