Maybe these grammar sources are of help too:
any: determiner and pronoun - indicates an indefinite quantity of something
any + of + noun phrase
Have you read any of her books?
I don �t like any of his music
Do any of you speak German
to refer to one or several people or things, or to part of something
(Scott Thornbury - Natural Grammar p 10)
When any of is followed by a plural subject, the verb can be singular or plural. A singular verb is more common in formal style.
If any of your friends is/are interested, let me know
(Michael Swan, Practical English Usage p 57)