How to pass my attribute class as a parameter in this code

I need to pass the AuthorAttribute class as a parameter so I can have a generic class in the code
AuthorAttribute authAttr = attr as AuthorAttribute; I want to make it dynamic, so I can pass whatever attribute class I need to pull the information out of:
Here is the main code:
public static Dictionary<string, string> GetAuthors(so I need to pass the AuthorAttribute in from here) { Dictionary<string, string> _dict = new Dictionary<string, string>(); PropertyInfo[] props = typeof(Book).GetProperties(); foreach (PropertyInfo prop in props) { object[] attrs = prop.GetCustomAttributes(true); foreach (object attr in attrs) { AuthorAttribute authAttr = attr as AuthorAttribute; if (authAttr != null) { string propName = prop.Name; ...