APA (7th ed.) Citation

Diethelm, W. (1976). Signet signal symbol. Editorial Blume.

Chicago Style (17th ed.) Citation

Diethelm, Walter. Signet Signal Symbol. Barcelona: Editorial Blume, 1976.

MLA (9th ed.) Citation

Diethelm, Walter. Signet Signal Symbol. Editorial Blume, 1976.

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