Stevenson, Leslie, author
Oxford University Press, 1974
Buku Teks
Stigler, Stephen M., author
Harvard University Press, 2019
Buku Teks
edited by E. F. Bozman
J. M. Dent & Sons, 1958
Buku Referensi
Miller, George A., author
Basic Books, 1967
Buku Teks
Murray, Joan
Hurtig, 1984
Buku Teks