एपीए उद्धरण

(1970). 1970 Ayer directory: Newspapers, magazines and trade publications. Pennsylvania:.

शिकागो स्टाइल उद्धरण

1970 Ayer Directory: Newspapers, Magazines and Trade Publications. Pennsylvania:, 1970.

एमएलए उद्धरण

1970 Ayer Directory: Newspapers, Magazines and Trade Publications. Pennsylvania:, 1970.