Aitken, A.C., author
Oliver and Boyd , 1974
Buku Teks SO
Stigler, Stephen M., author
Harvard University Press, 2019
Buku Teks
Blackwell, David, author
Dover, 1954
Buku Teks
Barnett, Vic, author
John Wiley & Sons, 1982
Buku Teks
Keeping, E.S., author
Van Nostrand Reinhold, 1962
Buku Teks