APA (7th ed.) Citation

Schach-Echo. Schachverlag O. Katzer.

Chicago Style (17th ed.) Citation

Schach-Echo. Konigstein im Taunus: Schachverlag O. Katzer.

MLA (9th ed.) Citation

Schach-Echo. Schachverlag O. Katzer.

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