Do you know what kind of process use mathwolfram in determining \begin{align} &\sum_{m = 1}^{n}\left[\frac{1}{-s + m} + \frac{1}{s + m}\right] \\[3mm] = &\ \Psi_{0}\left(-s + n + 1\right) + \Psi_{0}\left(s + n + 1\right) \\[2mm] - &\ \,\Psi_{0}\left(1 - s\right) - \Psi_{0}\left(s + 1\right) \end{align}
giving literature reference $?$.