Russell, Richard Joel, author
Macmillan, 1958
Buku Teks
Pollock, David C., author
Nicholas Brealey Pub. , 2001
Buku Teks
Birkhauser verlag, 1998
Buku Teks
Russell, Richard Joel, author
Macmillan, 1954, 1951
Buku Teks
Lechner, Frank J., author
Blackwell, 2005
Buku Teks