Young, P., & Schmid, C. F. (1966). Scientific social surveys and research: An introduction to the background, content, methods, principles and analysis of social studies (4th ed.). Prentice-Hall ; Prentice-Hall.

Young, Pauline, and Calvin Fisher Schmid. Scientific Social Surveys and Research: An Introduction to the Background, Content, Methods, Principles and Analysis of Social Studies. 4th ed. Englewood Cliffs, N.J. : New Delhi: Prentice-Hall ; Prentice-Hall, 1966.

Young, Pauline, and Calvin Fisher Schmid. Scientific Social Surveys and Research: An Introduction to the Background, Content, Methods, Principles and Analysis of Social Studies. 4th ed. Prentice-Hall ; Prentice-Hall, 1966.