How to take a bus directly from Guangzhou to Hong Kong Airport?

There are buses to Hong Kong Airport from the Garden Hotel, China Hotel, Rosedale Hotel, Guangzhou Hotel, Landmark Hotel, Tianhe Haitao Hotel, etc., every 05:15-17:00 The bus departs every hour and the journey takes about 4 hours. For specific bus schedules or to purchase tickets, you can call each hotel or 11185-3 to inquire.