(1994). Putting customers first: Standards for serving the american poeple. Washington: [Washington].
Παραπομπή Chicago StylePutting Customers First: Standards for Serving the American Poeple. Washington: [Washington], 1994.
Παραπομπή MLAPutting Customers First: Standards for Serving the American Poeple. Washington: [Washington], 1994.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.