Kuzniak, Marek
University of Wroclow , 2014
Buku Teks
Wolk, Harry I., author
Ohio South-Western College , 1997
Buku Teks
Korowicz, Marek St.
Martinus Nijhoff, 1964
Buku Teks
Strauss, Claudia, Author
Cambridge University Press, 1997
eBooks
Festinger, Leon, 1919-1989, author
Stanford University Press, 1962
Buku Teks