APA (7th ed.) Citation

Petersen, R. H. (1981). Ramaria subgenus Echinoramaria. Cramer.

Chicago Style (17th ed.) Citation

Petersen, Ronald H. Ramaria Subgenus Echinoramaria. Vaduz: Cramer, 1981.

MLA (9th ed.) Citation

Petersen, Ronald H. Ramaria Subgenus Echinoramaria. Cramer, 1981.

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