Laitinen, Herbert A. (Herbert August), 1915-
McGraw-Hill, 1975
Buku Teks SO
Washington, D.C. I.C.A. 1957,
Buku Teks
Autodesk Inc., 1986
Buku Referensi
Estridge, Barbara H.
Delmar Cengage Learning, 2012
Buku Teks SO
Moore, John B.
Reston Publishing, 1984
Buku Teks SO