(Guitar Method). A complete guide diagramming over 1,000 guitar chords in their most common voicings. The book is arranged chromatically and each chord is illustrated in three ways for three levels of the easiest form of the chords for the beginner and the more difficult versions for the intermediate and advanced players. Note names of each string are indicated on each chord diagram to let the player know what notes are being played in the chord.
Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.