APA-referens (7:e uppl.)

Tunbridge, E., Harrison, P., Warden, D., Refsum, H., Johnston, C., & Smith, D. (2007). Human plasma homocysteine levels are associated with the catechol-O-methyltransferase Val158Met polymorphism.

Chicago-referens (17:e uppl.)

Tunbridge, E., P. Harrison, D. Warden, H. Refsum, C. Johnston, och D. Smith. Human Plasma Homocysteine Levels Are Associated with the Catechol-O-methyltransferase Val158Met Polymorphism. 2007.

MLA-referens (9:e uppl.)

Tunbridge, E., et al. Human Plasma Homocysteine Levels Are Associated with the Catechol-O-methyltransferase Val158Met Polymorphism. 2007.