Elias Sukardi
UI-Press, 1984
Buku Teks SO
Chusid, J.G.
Gadjah Mada University Press , 1982
Buku Teks SO
Pick, James B.
Westview , 1989
Buku Referensi
De Paredes, Ellen Shaw
Wolters Kluwer, Lippincott Williams & Wilkins, 2007
Buku Referensi
Dodd, Everett E.
McGraw-Hill, 1979
Buku Teks SO