Brownell, Baker
Harper & Brothers publishers, 1950
Buku Teks
Baruch, Bernard M.
Sinmon and Schuster, 1954
Buku Teks SO
Weston, Michael
Routledge, 2001
Buku Teks SO
Chu, Hsi
Probsthain, 1922
Buku Teks SO
Ruse, Michael
Cambridge University Press, 2012
Buku Teks SO