N.W. Ayer & Son. (1930). N. W. Ayer & Son's Directory Newspapers and Periodicals: A guide to publications printed in the United States and its territories, the Dominion of Canada, Bermuda, the Republics of Panama and the Philippines [...]. N. W. Ayer and Son.
Cita Chicago Style (17a ed.)N.W. Ayer & Son. N. W. Ayer & Son's Directory Newspapers and Periodicals: A Guide to Publications Printed in the United States and Its Territories, the Dominion of Canada, Bermuda, the Republics of Panama and the Philippines [...]. Philadelphia: N. W. Ayer and Son, 1930.
Cita MLA (9a ed.)N.W. Ayer & Son. N. W. Ayer & Son's Directory Newspapers and Periodicals: A Guide to Publications Printed in the United States and Its Territories, the Dominion of Canada, Bermuda, the Republics of Panama and the Philippines [...]. N. W. Ayer and Son, 1930.