Santayana, George, author
Columbia University Press, 1995
Buku Teks
Cook, Roy T., 1972-,author
Polity, 2013
Buku Teks
Moreno, Fransisco Jose
Rajawali Pers, 1977
Buku Teks
Prior, Arthur N.
At The Clarendon Press, 1956
Buku Teks
Leblanc, Hugues
Mass. Allyn and Bacon , 1974
Buku Teks