APA Citatie

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

Chicago Style citaat

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

MLA citatie

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

Let op: Deze citaties zijn niet altijd 100% accuraat.