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Buku Teks
edited by Jos C.N. Raadschelders, Theo A.J. Toonen and Frits M. van der Meer
Palgrave Macmillan, 2007
Buku Teks
Langer, William L., author
Alfred A. Knoff, 1951
Buku Teks
Langer, William L., author
Harper Torchbooks, 1969
Buku Teks
Longman, 1995
Buku Teks