APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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