Supplementary materials for 30 Years of TEFLIN Journals. The materials consist of Results of Bibliometric Analysis of TEFLIN Journal in the Four Aacademic Search Engines along with Abstract and Citation Databases (Publish or Perish software; Results of Bibliometric Analysis of TEFLIN Journal in Microsoft Academic (1990-2019) (Publlish or Perish software); Criteria of Bibliometric Analysis in VOSviewer (VOSviewer); Co-authorship Analyis of Authors (VOSviewer); Co-authorship Analyis of Organizations (VOSviewer); Co-occurence of Fields of Study (VOSviewer); Citations of Documents (VOSviewer); Citations of Authors (VOSviewer); Citations of Organizations (VOSviewer); Bibliographic Coupling of Documents (VOSviewer); Bibliographic Coupling of Authors (VOSviewer); Bibliographic Coupling of Organizations (VOSviewer). Two pieces of free software used in the bibliometric analyses are Publish or Perish (Harzing, 2007) and VOSviewer (Eck & Waltman, 2020).

{"references": ["Harzing, A. W. (2007). Publish or Perish. Retrieved from https://harzing.com/resources/publish-or-perish", "Eck, N. J. van, & Waltman, L. (2020). VOSviewer (Version 1.6.15). Leiden: Centre for Science and Technology Studies (CWTS) of Leiden University."]}