APA (7th ed.) Citation

PTT-Union. (1900). 100 Jahre Sektion Zürich-Post. PTT-Union.

Chicago Style (17th ed.) Citation

PTT-Union. 100 Jahre Sektion Zürich-Post. PTT-Union, 1900.

MLA (8th ed.) Citation

PTT-Union. 100 Jahre Sektion Zürich-Post. PTT-Union, 1900.

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