APA (7th ed.) Citation

Clayden, G., & Agnarsson, U. (1991). Constipation in childhood. Oxford Univ. Pr.

Chicago Style (17th ed.) Citation

Clayden, Graham, and Ulfur Agnarsson. Constipation in Childhood. Oxford u.a: Oxford Univ. Pr, 1991.

MLA (9th ed.) Citation

Clayden, Graham, and Ulfur Agnarsson. Constipation in Childhood. Oxford Univ. Pr, 1991.

Warning: These citations may not always be 100% accurate.