Sawyer, R. Keith (Robert Keith), author
Wiley, 2013
Buku Teks
edited by P.E. Vernon
Penguin Books, 1970
Buku Teks
Sawyer, R. Keith, author
Oxford University Press, 2006
Buku Teks
Weisberg, Robert W., author
John Wiley & Sons, 2006
Buku Teks
Weisberg, Robert W., author
John Wiley & Sons, 2006
Buku Teks