ArXiv Front: NA Numerical Analysis: Numerical analysis section of the mathematics e-print arXiv.
Numerical Recipes Home Page: Books on-line, updates, and electronic purchasing.
Reviews of Numerical Recipes in C: First and second editions, collected at Lysator.
Spline Bibliography: Begun by Larry Schumaker and kept up by Carl de Boor. The references are sorted alphabetically by author, with a searchable index.