Dobbyn, John F.
West Publishing, 1989
Buku Teks
Bruce D. Mudget [and others]
Alexander Hamilton Institute, 1962
Buku Teks
Mowbray, Albert H.
McGraw-Hill, 1955
Buku Teks
Eggers, Peter MacDonald
Routledge, 2018
Buku Teks
Bickelhaupt, David L. (David Lynn)
Richard D. Irwin, 1983
Buku Teks