Dyfyniad APA

John, F. (2025). Effective Writing Skills for Public Relations (Fourth Edition). Library of Congress Cataloging-in-Publication Data.

Dyfyniad Arddull Chicago

John, Foster. Effective Writing Skills for Public Relations (Fourth Edition). Library of Congress Cataloging-in-Publication Data, 2025.

Dyfyniad MLA

John, Foster. Effective Writing Skills for Public Relations (Fourth Edition). Library of Congress Cataloging-in-Publication Data, 2025.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.