The best replacement for sources is resources.

The best alternatives to sources are rated as following:
★★★★★  resources
★★★  secondary sources
★★★  references
★★★  sinks
★★  bibliography
★★  secondary
★  sources
★  resources difference
★  fossil fuels
★  popular sources
★  non renewable
★  web-based research sources
★  relevant sources
  website sources
  primary sources
  bad sources
  internet sources
  independent sources
  external sources
  electronic sources
  citations
  alibaba
  non credible sources
  renewable energy
  primary
  web-based research sources)

Your alternative for sources is not listed? Suggest!
Speaking about sources, one probably shouldn't forget about an author.

Other search terms related to sources and their ratings are:
★★★★★ an author
★★★★ citations
★ quotations
You have in mind a companion for sources and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sources in all years. Click on graph for more.
sources
resources
secondary sources