Palmer, Axel, author
Routledge, 2018
Buku Teks
University of Illinois Press, 1978
Buku Teks
Litton, Roger A., 1944-, author
Avebury, 1990
Buku Teks
Reid, Sue Titus, author
Holt, Rinehart and Winston, 1985
Buku Teks
Heidensohn, Frances, author
Macmillan, 1989
Buku Teks