edited by I. Livingstone
Penguin Books, 1971
Buku Teks
Andrerson, James E., author
Addison-Wesley, 1970
Buku Teks
Sorrett, 1977
Buku Teks
edited by David Pettit and Anne Hall
Victoria Sorret, 1978
Buku Teks
edited by Kenneth J. Arrow
M.I.T. Press , 1971
Buku Teks