United States. Federal Trade Commission. (2011). Knock, knock, who's there?: Want to buy a home security system? beware of home alarm sales scams. Federal Trade Commission.
Chicago Style (17th ed.) CitationUnited States. Federal Trade Commission. Knock, Knock, Who's There?: Want to Buy a Home Security System? Beware of Home Alarm Sales Scams. [Washington, D.C.]: Federal Trade Commission, 2011.
MLA (9th ed.) CitationUnited States. Federal Trade Commission. Knock, Knock, Who's There?: Want to Buy a Home Security System? Beware of Home Alarm Sales Scams. Federal Trade Commission, 2011.
Warning: These citations may not always be 100% accurate.