APA (7th ed.) Citation

Angell, H. R. (1929). Purple blotch of onion Macrosporium porri Ell ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Angell, H. R. Purple Blotch of Onion Macrosporium Porri Ell. [Sonderdr.]. 1929.

MLA (9th ed.) Citation

Angell, H. R. Purple Blotch of Onion Macrosporium Porri Ell. [Sonderdr.]. 1929.

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