APA (7th ed.) Citation

Candolle, A. d. (1890). Candolle, Alphonse de Oct. 20, 1890 [to S. Watson] [postcard]. Zenodo.

Chicago Style (17th ed.) Citation

Candolle, Alphonse de. Candolle, Alphonse De Oct. 20, 1890 [to S. Watson] [postcard]. Zenodo, 1890.

MLA (9th ed.) Citation

Candolle, Alphonse de. Candolle, Alphonse De Oct. 20, 1890 [to S. Watson] [postcard]. Zenodo, 1890.

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