Ehrlich, Paul R.
McGraw-Hill, 1976
Buku Teks
Elsevier Science Inc., 660, 2018
Majalah, Jurnal, Buletin
Galbraith, John Kenneth, 1908-2006
Houghton Miffiln, 1958
Buku Teks
Davis, Kingsley, 1908-1997
Macmillan, 1949
Buku Teks
Sykes, Gresham M.
Random Hoese, 1963
Buku Teks