APA (edition "APA 6") Other

the New York Philharmonic anddevelopment of American concert music in the 19th century(this is my theme, please research about it, and focus on the theme to do)

Using 3-5 valuable resources in the reference. But you have to use the material which is Philharmonic: A History of New York’s Orchestra by Howard Shanet, then you need use the other two more resources. (the latter at a reputable site, please, and this does not include Wikipedia or other sites with anonymous contributors)