Stenlund, Soren
Routledge, 1990
Buku Teks
Oxford University Press , 1996
Buku Teks
edited by Ernest Sosa, Enrique Villanueva
Blackwell , 2006
Buku Teks
Katz, Jerrold J., author
George Allen and Unwin, 1972
Buku Teks
Muhlhausler, Peter, author
Routledge, 1996
Buku Teks