Pleural effusion - Heart & Vascular Institute Overview. Cleveland Clinic. http://my.clevelandclinic.org/disorders/pleural_effusion/ts_overview.aspx. Accessed June 2016.
Saguil A, Wyrick K, Hallgren J. Diagnostic approach to pleural effusion. Family Practice Physician. Am Fam Physician. 2014 Jul 15;90(2):99-104. http://www.aafp.org/afp/2014/0715/p99.html. Accessed June 2016.