Altschul, Aaron M.
Basic books, 1965
Buku Teks
edited by Wei Wang, Christopher J. Roberts
John Wiley & Sons, 2010
eBooks
Sackheim, George I.
Macmillan, 1973
Buku Teks
Leicester, Henry M.
McGraw-Hill, 1952
Buku Teks
Bodner, George M.
John Wiley & Sons, 1995
Buku Teks