APA (7th ed.) Citation

Postal, Telegraph and Telephone International. (1957). PTT-bulletinen.

Chicago Style (17th ed.) Citation

Postal, Telegraph and Telephone International. PTT-bulletinen. Bern, 1957.

MLA (9th ed.) Citation

Postal, Telegraph and Telephone International. PTT-bulletinen. 1957.

Warning: These citations may not always be 100% accurate.