Lua APA (7ú heag.)

PARKER, J. (2001). Emma's problem.-- ed.1. McGraw-Hill Interamericana.

Lua i Stíl Chicago (17ú heag.)

PARKER, John. Emma's Problem.-- Ed.1. Mexico: McGraw-Hill Interamericana, 2001.

Lua MLA (9ú heag.)

PARKER, John. Emma's Problem.-- Ed.1. McGraw-Hill Interamericana, 2001.

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