APA
Siafakas N. M., Anthonisen N. R. & Georgopoulos D. (2004). Acute exacerbations of chronic obstructive pulmonary disease. New York: M. Dekker.
Chicago
Siafakas N M, Anthonisen N R and Georgopoulos Dimitris. 2004. Acute exacerbations of chronic obstructive pulmonary disease. New York: M. Dekker.
Harvard
Siafakas N. M., Anthonisen N. R. and Georgopoulos D. (2004). Acute exacerbations of chronic obstructive pulmonary disease. New York: M. Dekker.
MLA
Siafakas N M, Anthonisen N R and Georgopoulos Dimitris. Acute exacerbations of chronic obstructive pulmonary disease. New York: M. Dekker. 2004.