Langer, Susanne K., author
Dover, 1953
Buku Teks
Husserl, Edmund, author
Claassen & Goverts, 1948
Buku Teks
Pos, H.J., author
Van Loghum Slaterus, 1947
Buku Teks
Tidman, Paul, author
Wadsworth, 1999
Buku Teks
Hausman, Alan, author
Wadsworth and Cengage Learning, 2013
Buku Teks