Asher, H. B., & Lewis-Beck, M. S. (1983). Causal modeling (2nd ed.). Sage Publications.
Lua i Stíl Chicago (17ú heag.)Asher, Herbert B., agus Michael S. Lewis-Beck. Causal Modeling. 2nd ed. Beverly Hills ;: London: Sage Publications, 1983.
Lua MLA (8ú heag.)Asher, Herbert B., agus Michael S. Lewis-Beck. Causal Modeling. 2nd ed. Sage Publications, 1983.
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