APA

Edrington T. B., Szczotka L. B., Barr J. T., Achtenberg J. F., Burger D. S., Janoff A. M., Olafsson H. E., Chun M. W., Boyle J. W., Gordon M. O. & Zadnik K. (19991112). Rigid contact lens fitting relationships in keratoconus. Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. : Optometry and vision science : official publication of the American Academy of Optometry.

Chicago

Edrington T B, Szczotka L B, Barr J T, Achtenberg J F, Burger D S, Janoff A M, Olafsson H E, Chun M W, Boyle J W, Gordon M O and Zadnik K. 19991112. Rigid contact lens fitting relationships in keratoconus. Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. : Optometry and vision science : official publication of the American Academy of Optometry.

Harvard

Edrington T. B., Szczotka L. B., Barr J. T., Achtenberg J. F., Burger D. S., Janoff A. M., Olafsson H. E., Chun M. W., Boyle J. W., Gordon M. O. and Zadnik K. (19991112). Rigid contact lens fitting relationships in keratoconus. Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. : Optometry and vision science : official publication of the American Academy of Optometry.

MLA

Edrington T B, Szczotka L B, Barr J T, Achtenberg J F, Burger D S, Janoff A M, Olafsson H E, Chun M W, Boyle J W, Gordon M O and Zadnik K. Rigid contact lens fitting relationships in keratoconus. Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study Group. : Optometry and vision science : official publication of the American Academy of Optometry. 19991112.