Corollary 4 (p. 123) in Hlawka, Taschner, and Schoissengeier, Geometric and Analytic Number Theory
Theorem 7.10 (p. 111) in Ayoub, An Introduction to the Analytic Theory of Numbers.
Theorem 3.4.5 (p. 134) in Jameson, The Prime Number Theorem.
Theorem 5.20 (p. 239) in Narkiewicz, The Development of Prime Number Theorey from Euclid to Hardy and Littlewood
Theorem 5.9 (p. 100) in Bateman and Diamond, Analytic Number Theory: An Introductory Course.