S

Sabi

ScienceDirect

SciFinder

SCONUL : Society of College, National and University Libraries

Scopus

SELL : Southern European Libraries Link

Sello de Calidad de Edición Académica CEA-APQ

Sello Calidad FECYT

SICI : Serial Item and Contribution Identifier

SJR : Scimago Journal & Country Rank

SLA : Special Libraries Association

Sociological Abstracts

SPORTDiscus

SSRN : Social Science Research Network

Subito

SUSHI : Standardized Usage Statistics Harvesting Initiative