References
- Finlayson , HC . 1987 . The place of ln x among the powers of x . Amer. Math. Monthly , 94 : 450
- Stewart , J . 2006 . Calculus Concepts & Contexts, , 3rd , Belmont, CA : Thomson .
- Olmsted , JHM . 1961 . Advanced Calculus , New York : Appleton-Century-Crofts .