Henerson, M. E., Morris, L. L., & Fitz-Gibbon, C. T. (1987). How to measure attitudes (2nd ed.). Sage Publications.
Lua i Stíl Chicago (17ú heag.)Henerson, Marlene E., Lynn Lyons Morris, agus Carol Taylor Fitz-Gibbon. How to Measure Attitudes. 2nd ed. Newbury Park, Calif.: Sage Publications, 1987.
Lua MLA (8ú heag.)Henerson, Marlene E., et al. How to Measure Attitudes. 2nd ed. Sage Publications, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.