APA (7th ed.) Citation

Gradstein, S. R. (1979). Directory of bryologists and bryological research (2d [rev.] ed.). Bohn, Scheltema & Holkema.

Chicago Style (17th ed.) Citation

Gradstein, S. R. Directory of Bryologists and Bryological Research. 2d [rev.] ed. Utrecht: Bohn, Scheltema & Holkema, 1979.

MLA (9th ed.) Citation

Gradstein, S. R. Directory of Bryologists and Bryological Research. 2d [rev.] ed. Bohn, Scheltema & Holkema, 1979.