APA (7th ed.) Citation

Gradstein, S. R. (1973). Directory of bryologists and bryological research. Oosthoek.

Chicago Style (17th ed.) Citation

Gradstein, S. R. Directory of Bryologists and Bryological Research. Utrecht: Oosthoek, 1973.

MLA (9th ed.) Citation

Gradstein, S. R. Directory of Bryologists and Bryological Research. Oosthoek, 1973.

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