APA

Simonsen R. J., International Symposium on Dentistry in the 21st Century B. 1., . (1989). Dentistry in the 21st century. : Quintessence Books.

Chicago

Simonsen Richard J, International Symposium on Dentistry in the 21st Century Berlin 1989, . 1989. Dentistry in the 21st century. : Quintessence Books.

Harvard

Simonsen R. J., International Symposium on Dentistry in the 21st Century B. 1., . (1989). Dentistry in the 21st century. : Quintessence Books.

MLA

Simonsen Richard J, International Symposium on Dentistry in the 21st Century Berlin 1989, . Dentistry in the 21st century. : Quintessence Books. 1989.