APA
(1999). Journal of the International academy of periodontology. U.K: FDI World dental press Ltd.
Chicago
1999. Journal of the International academy of periodontology. U.K: FDI World dental press Ltd.
Harvard
(1999). Journal of the International academy of periodontology. U.K: FDI World dental press Ltd.
MLA
Journal of the International academy of periodontology. U.K: FDI World dental press Ltd. 1999.
