APA

Weber W. A., Gradstein S. R., Lanier J. & Simpson . H. J. M. (1977). Bryophytes and lichens of the Galápagos Islands. : .

Chicago

Weber William A, Gradstein S R, Lanier Jeannine and Simpson H J M. 1977. Bryophytes and lichens of the Galápagos Islands. : .

Harvard

Weber W. A., Gradstein S. R., Lanier J. and Simpson . H. J. M. (1977). Bryophytes and lichens of the Galápagos Islands. : .

MLA

Weber William A, Gradstein S R, Lanier Jeannine and Simpson H J M. Bryophytes and lichens of the Galápagos Islands. : . 1977.