Mytinger, Caroline
Macmillan, 1946
Buku Teks
Schmitz, Carl A.
Mouton & Co. Publishers, 1963
Buku Teks
Forrest, Thomas, author
Oxford University Press, 1969
Buku Teks
Woolford, Donald Mark, author
University of Queensland Press, 1976
Buku Teks
Hogbin, Herbert Ian, author
Routledge and Kegan Paul, 1951
Buku Teks