Welkowitz

The Hidden Face of Shyness by Schneier,Welkowitz Avon Books Paperback 31 December 1997 from£10.12 | RRP: ~~£8.11~~
Introductory Statistics for the Behavioral Sciences: WITH SPSS Statistical Software CD-ROM Version 14.0 by Joan Welkowitz John Wiley & Sons Hardcover 6 October 2006 from£94.50 | RRP: ~~£65~~
Introductory Statistics for the Behavioral Sciences by Joan Welkowitz,Robert B Ewen,Jacob Cohen Harcourt College Publishing Hardcover 1 July 1999 from£24.23 | RRP: ~~£24.95~~