RUMMEL, R. (1970). Aplied Factor Analysis R.j. Rummel. Northwestern University.
Lua i Stíl Chicago (17ú heag.)RUMMEL, R.J. Aplied Factor Analysis R.j. Rummel. Northwestern University, 1970.
Lua MLA (8ú heag.)RUMMEL, R.J. Aplied Factor Analysis R.j. Rummel. Northwestern University, 1970.
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