Siegel, Curt
Van Nostrand Reinhold, 1962
Buku Teks SO
Habraken, N.J.
MIT Press, 2000
Buku Teks SO
edited by Max Coltheart
Psychology Press, 1996
Buku Teks SO
edited by Fisiak Jacek and Stanislaw Pupels
John Benjamins B.V., 1992
Buku Teks SO
Siegel, Curt
Universitas Parahyangan, [date of publication not identified]
Buku Teks SO