Tertiary Sources Tertiary sources are publications that summarize and digest the information in primary and secondary sources to provide background on a topic, idea, or event. Encyclopedias and biographical dictionaries are prime examples of tertiary sources.
From Wikipedia, the free encyclopedia. A value-added service (VAS) is a popular telecommunications industry term for non-core services, or in short, all services beyond standard voice calls and fax transmissions. However, it can be used in any service industry, for services available at little or no cost, to promote their primary business.
AFS Intercultural Programs (or AFS, originally the American Field Service) is an international youth exchange organization. Worldwide, AFS is a group of over 50 independent, not-for-profit organizations called partners, each with its own network of volunteers, professionally staffed office(s), volunteer board of directors and website.