APA Style

Colledge, N, A, B, &, N, R. (2006). Davidson's Principles and Practice of Medicine (20th (R)). UK: Churchill Livingstone.

MLA Style

Colledge, Nicholas, A., Boon, &, Nickir, R.. "Davidson's Principles and Practice of Medicine". 20th (R) UK: Churchill Livingstone, 2006. Text.