Cita APA (7th ed.)

Guppy, N., & Gray, G. (2008). Successful surveys: Research methods and practice (4th ed.). Nelson Thomson.

Cita Chicago (17th ed.)

Guppy, Neil, i George Gray. Successful Surveys: Research Methods and Practice. 4th ed. Australia: Nelson Thomson, 2008.

Cita MLA (9th ed.)

Guppy, Neil, i George Gray. Successful Surveys: Research Methods and Practice. 4th ed. Nelson Thomson, 2008.