Repplier, A Agnes
Mifflin , 1921
Buku Teks
Flower, William Henry, author
Routledge/Thoemmes Press, 1996
Buku Referensi
edited by P.N. Campbell and R.D. Marshall
Academic Press, 1981
Buku Teks
Pigou, A.C. (Arthur Cecil), 1877-1959, author
Macmillan, 1952
Buku Teks
Laplanche, Jean
Routledge, 1999
Buku Teks