Gillespie, Alexander, author
Oxford University press, 2014
Buku Teks
James, Francis Edmund Skone
Sweet & Maxwell, 1958
Buku Teks
Starling, Grover, author
Kent Publishing, 1985
Buku Teks
Kuhn, James W., author
Harcourt, Brace & World, 1968
Buku Teks
edited by Marion Jansen, Joost Pauwelyn and Theresa Carpenter
Cambridge University Press, 2017
Buku Teks