APA-referens (7:e uppl.)

Ibbotson, H., Le Tall, B. B., & Waller, A. R. (1884). The ferns of York: Including also Nidderdale and the districts around Thirsk, Scarbro', and Whitby. W. Sessions.

Chicago-referens (17:e uppl.)

Ibbotson, Henry, Benjamin Bower Le Tall, och A. R. Waller. The Ferns of York: Including Also Nidderdale and the Districts Around Thirsk, Scarbro', and Whitby. York: W. Sessions, 1884.

MLA-referens (8:e uppl.)

Ibbotson, Henry, et al. The Ferns of York: Including Also Nidderdale and the Districts Around Thirsk, Scarbro', and Whitby. W. Sessions, 1884.