Lua APA (7ú heag.)

Liebert,Roberyt M. (1994). Personality strategies and issues (7th ed.). Brooks/Cole.

Lua i Stíl Chicago (17ú heag.)

Liebert,Roberyt M. Personality Strategies and Issues. 7th ed. California: Brooks/Cole, 1994.

Lua MLA (9ú heag.)

Liebert,Roberyt M. Personality Strategies and Issues. 7th ed. Brooks/Cole, 1994.

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