Benjamin Fine, Gerhard Rosenberger – Number Theory An Introduction Via The Distribution of Primes
Section 4.2 Chebychev’s Estimate and Some Consequences. (p.136ff)
Version in the book:
Section 4.6 The Prime Number Theorem – The Elementary Proof (p.180ff)
Jeffrey Stopple – A Primer of Analytic Number Theory
Section 5.2 Chevyshev’s Estimates
Version in the book:
http://www.math.columbia.edu/~goldfeld/ErdosSelbergDispute.pdf
http://en.wikipedia.org/wiki/Prime_number_theorem
Sylvester’s Papers: http://quod.lib.umich.edu/cgi/t/text/text-idx?c=umhistmath&idno=AAS8085

