Walter, Eugene Victor, author
Chapel Hill, 1988
Buku Teks
Brady, Emily, editor
Springer, 2012
eBooks
Treshow, Michael, author
McGraw-Hill, 1976
Buku Teks
edited by Jonathan Rigg
Archipelago Press, 1996
Buku Teks
Getis, Arthur, author
Macmillan, 1985
Buku Teks