Pinpinat Leela-Ampornsin. (2011) Learning achievement and opinion of second-year English and Business English majored students studying English for Airline Business at Phetchaburi Rajabhat University using a skill-based course book /. Phetchaburi Rajabhat University,:ม.ป.ท.Pinpinat Leela-Ampornsin. 2011. Learning achievement and opinion of second-year English and Business English majored students studying English for Airline Business at Phetchaburi Rajabhat University using a skill-based course book /. ม.ป.ท.:Phetchaburi Rajabhat University,;Pinpinat Leela-Ampornsin. Learning achievement and opinion of second-year English and Business English majored students studying English for Airline Business at Phetchaburi Rajabhat University using a skill-based course book /. ม.ป.ท.:Phetchaburi Rajabhat University, 2011. Print.