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• Sabi
  

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• ScienceDirect
  

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• SciFinder
  

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• SCONUL : Society of College, National and University Libraries
  

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• Scopus
  

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• SELL : Southern European Libraries Link
  

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• SICI : Serial Item and Contribution Identifier
  

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• SIGLE : System for Information on Grey Literature in Europe — Véase OpenGrey
  

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• SJR : Scimago Journal & Country Rank
  

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• SLA : Special Libraries Association
  

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• Sociological Abstracts
  

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• Subito
  

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• SUSHI : Standardized Usage Statistics Harvesting Initiative