Hoyle, Rick. Research methods in social relations / Rick H. Hoyle, Monica J. Harris, Charles M. Judd. - 7th ed. - London : Thomson Learning, 2002. - xxiii, 568 p. ISBN: 0155061399 : GBP 24.99 Subjects--Topical Terms: Social sciences--Research. LC Class. No.: H62 / .H69 2002