Adler, Bill
Jones-Irwin, 1985
Buku Teks SO
Johns, Dean
Strategic Information and Research Development Centre , 2010
Buku Teks SO
Ripley, William Z.
Little, Brown, and Company, 1927
Buku Teks
Ripley, William Z.
Little, Brown, and Company, 1927
Buku Teks SO
Ripley, William Z.
Little, Brown, and Company, 1927
Buku Teks SO