Question: What value has a reference book or e-book? Why, for example, consult a linguistics encyclopedia?
Answer:
In short, the reference works listed on this page are a great way to begin any research project.
An encyclopedia is a "book or numbered set of books containing authoritative summary information about a variety of topics in the form of short essays, usually arranged alphabetically by headword or classified in some manner. An entry may be signed or unsigned, with or without illustration or a list of references for further reading" (ODLIS).
A companion is a "handbook intended to be used in connection with the study of a particular subject or field" (ODLIS). Companions are excellent sources of introductory essays and topic overviews.
A handbook is a "single-volume reference book of compact size that provides concise factual information on a specific subject, organized systematically for quick and easy access" (ODLIS).
A bibliography is a "systematic list or enumeration of written works by a specific author or on a given subject, or that share one or more common characteristics (language, form, period, place of publication, etc.)" (ODLIS).
Penn State's Center for Language Acquisition compiled a 62-page, highly recommended Sociocultural Theory & . L2 Learning Bibliography
Also helpful is Resources for Researchers, consisting of lists of selected references (or bibliographies) on linguistics topics sponsored by the The International Research Foundation for English Language Education. Topics, not limited to English language teaching only, include Action Research, Anxiety in Language Learning and Assessment, Critical Pedagogy and Critical Research, Language Classroom Research, Pragmatics, Task Based Language Teaching, and many others. The lists are in Microsoft Word format.