Gaya APA

Richard, M. et al (2007). Felsons' Principles of Chest Roentgenology a Programmed Text . : Saunder Elsevier.Inc.

Gaya MLA

Richard, MarkP.. et al. "Felsons' Principles of Chest Roentgenology a Programmed Text". : Saunder Elsevier.Inc, 2007. Text.