APA

Collum L. M., Fitzsimon S., Hillery M., Collum A., Power W. J., Pelikan Z. & Jenson J. B. (19930630). Twice daily 4% Sodium Cromoglycate vs. 2% Sodium Cromoglycate used four times daily in seasonal (grass pollen) allergic conjunctivitis. : Documenta ophthalmologica. Advances in ophthalmology.

Chicago

Collum L M, Fitzsimon S, Hillery M, Collum A, Power W J, Pelikan Z and Jenson J B. 19930630. Twice daily 4% Sodium Cromoglycate vs. 2% Sodium Cromoglycate used four times daily in seasonal (grass pollen) allergic conjunctivitis. : Documenta ophthalmologica. Advances in ophthalmology.

Harvard

Collum L. M., Fitzsimon S., Hillery M., Collum A., Power W. J., Pelikan Z. and Jenson J. B. (19930630). Twice daily 4% Sodium Cromoglycate vs. 2% Sodium Cromoglycate used four times daily in seasonal (grass pollen) allergic conjunctivitis. : Documenta ophthalmologica. Advances in ophthalmology.

MLA

Collum L M, Fitzsimon S, Hillery M, Collum A, Power W J, Pelikan Z and Jenson J B. Twice daily 4% Sodium Cromoglycate vs. 2% Sodium Cromoglycate used four times daily in seasonal (grass pollen) allergic conjunctivitis. : Documenta ophthalmologica. Advances in ophthalmology. 19930630.