Norwood,, 1993
Buku Teks
Fellner, William, 1905-, author
McGraw-Hill, 1960
Buku Teks
Seager, William, author
[, Springer], 2012
eBooks
Moore, D. (David), 1942-, author
Cambridge University Press, 2013
Buku Teks
edited by Rodney Bruce Hall, Thomas J. Biersteker
Cambridge University Press, 2004
Buku Teks