Protocol - The Complete Handbook of Diplomatic, Official, and Social Usage (page 21), by Mary Jane McCaffree and Pauline Innes, published by Hepburn Books, Dallas, Texas [1]Αρχειοθετήθηκε 2012-03-01 στο Wayback Machine., 1977, 1985, 1989, 1997 (ISBN0-941402-04-5)
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Protocol - The Complete Handbook of Diplomatic, Official, and Social Usage (page 21), by Mary Jane McCaffree and Pauline Innes, published by Hepburn Books, Dallas, Texas [1]Αρχειοθετήθηκε 2012-03-01 στο Wayback Machine., 1977, 1985, 1989, 1997 (ISBN0-941402-04-5)