APA-referens (7:e uppl.)

Haworth, M., Hesselbo, S., McElwain, J., Robinson, S., & Brunt, J. (2005). Mid-Cretaceous pCO(2) based on stomata of the extinct conifer Pseudofrenelopsis (Cheirolepidiaceae).

Chicago-referens (17:e uppl.)

Haworth, M., S. Hesselbo, J. McElwain, SA Robinson, och J. Brunt. Mid-Cretaceous PCO(2) Based on Stomata of the Extinct Conifer Pseudofrenelopsis (Cheirolepidiaceae). 2005.

MLA-referens (9:e uppl.)

Haworth, M., et al. Mid-Cretaceous PCO(2) Based on Stomata of the Extinct Conifer Pseudofrenelopsis (Cheirolepidiaceae). 2005.