Topsøe, Flemming (2007), "Some bounds for the logarithmic function"(PDF), in Cho, Yeol Je; Kim, Jong Kyu; Dragomir, Sever S. (eds.), Inequality theory and applications, Vol. 4: Papers from the 8th International Conference on Nonlinear Functional Analysis and Applications held at Gyeongsang National University, Chinju and Kyungnam University, Masan, August 9–13, 2004, New York: Nova Science Publishers, pp. 137–151, ISBN978-1-59454-874-1, MR2349596
Deveci, Sinan (2022). "On a Double Series Representation of the Natural Logarithm, the Asymptotic Behavior of Hölder Means, and an Elementary Estimate for the Prime Counting Function". arXiv:2211.10751 [math.NT]. See Theorem 5.2. on pages 22 - 23
Harremoës, Peter (2011). "Is Zero a Natural Number?". arXiv:1102.0418 [math.HO]. A synopsis on the nature of 0 which frames the choice of minimum as the dichotomy between ordinals and cardinals.
Khristo N. Boyadzhiev (2022). "New series identities with Cauchy, Stirling, and harmonic numbers, and Laguerre polynomials". pp. 2, 6. arXiv:1911.00186 [math.NT].
Topsøe, Flemming (2007), "Some bounds for the logarithmic function"(PDF), in Cho, Yeol Je; Kim, Jong Kyu; Dragomir, Sever S. (eds.), Inequality theory and applications, Vol. 4: Papers from the 8th International Conference on Nonlinear Functional Analysis and Applications held at Gyeongsang National University, Chinju and Kyungnam University, Masan, August 9–13, 2004, New York: Nova Science Publishers, pp. 137–151, ISBN978-1-59454-874-1, MR2349596
Kifowit, Steven J. (2019). More Proofs of Divergence of the Harmonic Series(PDF) (Report). Prairie State College. Retrieved 2024-04-24. See Proofs 23 and 24 for details on the relationship between harmonic numbers and logarithmic functions.
Abramowitz, Milton (1965). Handbook of mathematical functions, with formulas, graphs, and mathematical tables. Irene A. Stegun. New York: Dover Publications. ISBN0-486-61272-4. OCLC429082.
