Online reference resources include online dictionaries, encyclopedias, atlases, almanacs. These resources are helpful for reseach when you want to find information about topics, locate facts, and answer questions.
Britannica Academic. One of the most trusted sources of information on any topic used in research to provide background information.
Oxford Reference Online Premium Collection contains about 125 dictionaries, language reference, and subject reference works.
The Augmented reality Handbook - Everything you need to know about Augmented Reality by 
A Dictionary of Computer Science by 
Encyclopedia of Software Engineering by 