Brian's book is the one that I reference.  There is alot of stuff for the newbie, but also has advanced practices.  Sybase, I don't know, but you'll being using SQL.  If you are going to write the report using stored procs, any book for T-SQL will get you 95% of the way there.  Sybase T-Sql is slightly different from SQL Server's T-SQL, but again, most of it is the same.  If you aren't going to use stored procedures, there isn't much you need to know that you won't find covered in a book on report writing.