This paper provides an in-depth review of the literature on citation impact indicators, which are used in research evaluation. The review covers the selection of publications and citations, normalization of indicators, counting methods for co-authored publications, and journal impact indicators. It also discusses the use of bibliographic databases such as Web of Science (WoS), Scopus, and Google Scholar. The paper highlights the importance of these indicators in research evaluation and the challenges in their calculation, including differences in database coverage and citation counting. It also addresses issues such as the exclusion of certain publication types (e.g., editorials, non-English language publications, self-citations), the choice of citation window, and the impact of language and journal internationality on citation metrics. The review emphasizes the need for careful selection of publications and citations to ensure accurate and meaningful citation impact indicators. It also notes that while citation impact indicators are widely used, they have limitations, and their interpretation and application require careful consideration. The paper concludes with recommendations for future research in this area.This paper provides an in-depth review of the literature on citation impact indicators, which are used in research evaluation. The review covers the selection of publications and citations, normalization of indicators, counting methods for co-authored publications, and journal impact indicators. It also discusses the use of bibliographic databases such as Web of Science (WoS), Scopus, and Google Scholar. The paper highlights the importance of these indicators in research evaluation and the challenges in their calculation, including differences in database coverage and citation counting. It also addresses issues such as the exclusion of certain publication types (e.g., editorials, non-English language publications, self-citations), the choice of citation window, and the impact of language and journal internationality on citation metrics. The review emphasizes the need for careful selection of publications and citations to ensure accurate and meaningful citation impact indicators. It also notes that while citation impact indicators are widely used, they have limitations, and their interpretation and application require careful consideration. The paper concludes with recommendations for future research in this area.