poorreza, A. (2001). Cost behavior in the field of health services. Social Security Journal, 3(1), 131–160.

poorreza, A. "Cost behavior in the field of health services", Social Security Journal, 3, 1, 2001, 131–160.

poorreza, A. (2001). 'Cost behavior in the field of health services', Social Security Journal, 3(1), pp. 131–160.

poorreza, A., "Cost behavior in the field of health services." Social Security Journal, 3 1 (2001): 131–160,

poorreza A. Cost behavior in the field of health services. Social Security Journal. 2001;3(1):131–160 (In Persian).