APA (7th ed.) Citation

Riedel, H. (2019). 100 Jahre Metro Madrid.

Chicago Style (17th ed.) Citation

Riedel, Hans-Ulrich. 100 Jahre Metro Madrid. 2019.

MLA (9th ed.) Citation

Riedel, Hans-Ulrich. 100 Jahre Metro Madrid. 2019.

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