Welch, S., & Comer, J. C. (1988). Quantitative methods for public administration: Techniques and applications (2nd ed.). Harcourt Brace College.
Lua i Stíl Chicago (17ú heag.)Welch, Susan, agus John C. Comer. Quantitative Methods for Public Administration: Techniques and Applications. 2nd ed. Fortworth: Harcourt Brace College, 1988.
Lua MLA (9ú heag.)Welch, Susan, agus John C. Comer. Quantitative Methods for Public Administration: Techniques and Applications. 2nd ed. Harcourt Brace College, 1988.
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