Balcer, Mary D., author
The University of Wisconsin Press, 1984
Buku Teks
Tullar, Richard M., author
McGraw-Hill, 1977
Buku Teks
Dobson, Frank S., author
Richmond, 1992
Buku Teks
Beatrix Beisner, Christian Messier, Luc-Alain Giraldeau
The University of Chicago Press, 2013
Buku Teks
Hubbard, L. Ron, 1911-1986, author
L. Ron Hubbard Library, 2009
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