Dr. Emily Mason had a research paper published in Update: Applications of Research in Music Education. The article, "Multicultural Music Represented in Current Elementary Music Textbooks: A Comparative Study of Two Published Music Series," is in the May 2010 issue of Update. This is a peer-reviewed paper. Update's focus is to bring current research to both scholars and practitioners in music education; the journal is published by MENC, the Music Educators National Conference.
https://www.ithaca.edu/intercom/article.php/20100419081240408