APA (7th ed.) Citation

Bulman, O. M. B. (1938). Graptolithina. Borntraeger.

Chicago Style (17th ed.) Citation

Bulman, O. M. B. Graptolithina. Berlin: Borntraeger, 1938.

MLA (9th ed.) Citation

Bulman, O. M. B. Graptolithina. Borntraeger, 1938.

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