Beach, Leslie R.
McGraw-Hill Book , 1959
Buku Teks
Smith, George Albert, author
Richard D. Irwin, 1960
Buku Teks
Galloway, Lee, author
Alexander Hamilton Institute, 1914
Buku Teks
Muhammad Umar Gumai, author
2016
UI - Tesis Membership
Griffin, Ricky W., author
Prentice-Hall, 1993
Buku Teks