Brenner, R.E. (2007). Understanding anime and manga. Westport, Connecticut: Libraries Unlimited.
Fletcher-Spear, K., & Jenson-Benjamin, M. (2010). Library collections for teens: Manga and graphic novels. New York: Neil-Schuman.
Goldsmith, F. (2005). Graphic novels now: Building, managing, and marketing a dynamic collection. Chicago: American Library Association.
Goldsmith, F. (2009). The readers’ advisory guide to graphic novels. Chicago: American Library Association.
Gravett, P. (2004). Manga: Sixty years of Japanese comics. New York: Harper Collins.
Kalen, E. (2012). Mostly manga: A genre guide to popular manga, manhwa, manhua, and anime. Westport, Conneticut: Libraries Unlimited.
Napier, S.J. (2000). Anime: from Akira to Princess Mononoke. New York: Palgrave.
An important question librarians often ask regarding collection development is "where can I find reviews about manga?" Additionally, other collection development concerns include having space for long-running titles (ie: Naruto, Bleach, etc.) and about ratings. Some publishers like Tokyopop put ratings on their manga, but because of cultural differences between Japan and America, and what is considered "appropriate" for children and teens, the ratings are not universal. Other than professional review sources, which I will list below, Googling titles will often give you a wealth of information from manga and anime consumers. Personal blogs, websites, and message boards entries can prove valuable.
No Flying No Tights, created by librarian and anime/manga guru Robin Brenner, reviews manga, graphic novels and anime. Additionally, there are great lists that come out, put together by the reviewers (myself included), including must-haves, broken up by age group, as well as worthwhile anime to watch on the popular Crunchyroll.com streaming website (now legal with ways for librarians and educators to sign up for free and paid accounts).
School Library Journal reviews manga, as well as Voices of Youth Advocates.