Gaya APA

Haas, D, F., Haas, D, S, S. (2000). The Chronic Bronchitis and Emphysema handbook . New York: John Willey & Sony, inc..

Gaya MLA

Haas, Dr., Francois., Haas, Dr., Sheila, Sperber. "The Chronic Bronchitis and Emphysema handbook". New York: John Willey & Sony, inc., 2000. Text.