Gradstein, S. R. (1979). Directory of bryologists and bryological research (2d [rev.] ed.). Bohn, Scheltema & Holkema.
Chicago Style (17th ed.) CitationGradstein, S. R. Directory of Bryologists and Bryological Research. 2d [rev.] ed. Utrecht: Bohn, Scheltema & Holkema, 1979.
MLA (9th ed.) CitationGradstein, S. R. Directory of Bryologists and Bryological Research. 2d [rev.] ed. Bohn, Scheltema & Holkema, 1979.
Warning: These citations may not always be 100% accurate.