@book{830010,
	author = {Office of the permanent secretary ministry of tourism and sports},
	title = {Front office functional competencies operate a private automatic branch exchange (PABX) switchboard},
	publisher = {Office of the permanent secretary ministry of tourism and sports,},
	year = {2015.},
	series = {Front office functional competencies operate a private automatic branch exchange (PABX) switchboard},
	address = {กรุงเทพมหานคร :}
}