A significant number of publications on interlinguistics and Esperanto studies would be improved if their authors had a more thorough knowledge of the significant scholarly literature. However, it is often difficult even for the specialist to find his or her way among current and older scholarly studies dealing with various aspects of planned languages ([“artificial”] world [auxiliary] languages). The current study is intended to facilitate access to the scholarly literature by drawing the reader’s attention to the myriad sources of material worthy of use by the researcher. Particularly included, in addition to monographs, are such sources as anthologies, Festschriften, conference proceedings, university dissertations, and planned-language periodicals both current and older. Especially valuable for up-to-date information are general and specialized interlinguistics bibliographies, bibliographically oriented bulletins, and periodically published international bibliographies with sections on interlinguistics. Yielding most information is the bibliography on modern languages and literatures published by the Modern Language Association (MLA) in New York, which registers the newest materials annually. Specialized libraries, more and more easily consulted on-line, provide large quantities of materials worthy of research. The Internet is playing a growing role in making literature in the field available.