Whittaker, Sir Edmund
Thomas Nelson and Sons Ltd., 1948
Buku Teks
Judovitz, Dalia, author
Cambridge University Press , 1988
Buku Teks
Sedgwick, Peter R., author
Blackwell, 2001
Buku Teks
cambridge, 2006
Buku Teks
Roy Wood Sellars; V.J. McGill; Marvin Farber (editor)
Macmillan, 1949
Buku Teks