APA (7th ed.) Citation

Hess, H. E., Landolt, E., & Hirzel, R. (1976). Nigritella nigra (L.) Rchb. 1851. Birkhaeuser.

Chicago Style (17th ed.) Citation

Hess, H. E., E. Landolt, and R. Hirzel. Nigritella Nigra (L.) Rchb. 1851. Birkhaeuser, 1976.

MLA (9th ed.) Citation

Hess, H. E., et al. Nigritella Nigra (L.) Rchb. 1851. Birkhaeuser, 1976.