Website  bibtex   

@book{
 title = {Astéries, ophiures, et échinides /  by R. Koehler.},
 type = {book},
 pages = {1 - 66},
 websites = {http://www.biodiversitylibrary.org/item/46011},
 publisher = {W. Heinemann,},
 city = {London :},
 id = {ff481b43-f534-32a0-ad9a-3632e35c5b57},
 created = {2012-10-26T12:49:03.000Z},
 accessed = {2012-10-26},
 file_attached = {false},
 profile_id = {c6c6f844-18d2-32db-a619-2e915134a952},
 group_id = {764582e8-5773-3a66-8d6b-9b40e4fb5a88},
 last_modified = {2017-03-14T17:27:14.020Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Koehler},
 bibtype = {book},
 author = {Koehler, R. and Koehler, R and (1907-1909), British Antarctic Expedition}
}