Twentieth Century Microtonal Notation. Gardner Read, Greenwood Press, 1990.
MT 35 .R252 1990

This covers the various ways microtonal notation has been handled, includes examples.

New Music Vocabulary. Howard Risatti, University of Illinois Press, 1975.
ML 431 R.6

A dictionary of notational symbols invented in the since WW II, includes examples.

Music Notation in the Twentieth-Century: A Practical Guidebook Kurt Stone, W.W. Norton, 1980.
MT 35 .S87 1980

Shows contemporary practice for traditional and non-traditional styles.

Coda Music (creators of Finale)
Comparison of Scorewriters (Wikipedia)

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