Ayer, A. J. (Alfred Jules), 1910-1989, author
Macmillan, 1963
Buku Teks
edited by Martin Fransman, Gerd Junne and Annemieke Roobeek
Blackwell, 1995
Buku Teks
Morris, Richard B., author
Van Nostrand Reinhold, 1955
Buku Teks
Schwab, Klaus, 1938-, author
Currency, 2017
Buku Teks
Bouman, P. J. (Pieter Jan)
McGraw-Hill , 1954
Buku Teks