Reynolds, Lloyd G.
Prentice-Hall, 1998
Buku Teks SO
Reynolds, Lloyd G.
Prentice-Hall, 1982
Buku Teks SO
Reynolds, Lloyd G.
Prentice-Hall, 1959
Buku Teks SO
Coombs, H.C. [Herbert Cole], 1906-
Macmillan, 1981
Buku Teks SO
Borjas, George J.
McGraw-Hill, 2010
Buku Teks SO