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.
Παραπομπή σε μορφή Chicago (17η εκδ.)Young, Pauline, και 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.
Παραπομπή σε μορφή MLA (8th εκδ.)Young, Pauline, και 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.
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