APA

Purk J. H., Eick J. D., Roberts M., Chappell R. P. & Moore D. L. (19910703). Fracture strength of Class I versus Class II restored premolars tested at the marginal ridge. 2. Cavosurface bonding and cavosurface plus internal enamel bonding. : Quintessence international (Berlin, Germany : 1985).

Chicago

Purk J H, Eick J D, Roberts M, Chappell R P and Moore D L. 19910703. Fracture strength of Class I versus Class II restored premolars tested at the marginal ridge. 2. Cavosurface bonding and cavosurface plus internal enamel bonding. : Quintessence international (Berlin, Germany : 1985).

Harvard

Purk J. H., Eick J. D., Roberts M., Chappell R. P. and Moore D. L. (19910703). Fracture strength of Class I versus Class II restored premolars tested at the marginal ridge. 2. Cavosurface bonding and cavosurface plus internal enamel bonding. : Quintessence international (Berlin, Germany : 1985).

MLA

Purk J H, Eick J D, Roberts M, Chappell R P and Moore D L. Fracture strength of Class I versus Class II restored premolars tested at the marginal ridge. 2. Cavosurface bonding and cavosurface plus internal enamel bonding. : Quintessence international (Berlin, Germany : 1985). 19910703.