Ryan, William
Equality / William Ryan
Vintage Books, 1982
 Buku Teks
Ryan, W.J.L
Price theory / W.J.L Ryan
Macmillan, 1977
 Buku Teks
Ryan, William T
Principles of marketing/ by William Ryan
Richard D. Irwin, 1980
 Buku Teks
geestelijk Nederland 1920-1940: deel II de wetenschappen van natuur, mens en maatschappij / door K.F. Proost [et al.]
Kosmos, 1948
 Buku Teks
Focus on The Netherlands / Ministry of Foreign Affairs, International Information and Communication Division.
Ministry of Foreign Affairs The Netherlands, 2004
 Buku Referensi
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