Haveman, Robert H., author
John Wiley, 1970
Buku Teks
Sydanmaanlakka, Pentti, author
Capstone Publishing Limited (a Wiley company), 2002
Buku Teks
The Brookings Institution , 1966
Buku Teks
Roger, Weiss, author
Random House, 1969
Buku Teks
Stojadinovi, Slavenko M., author
Springer Nature, 2019
eBooks