APA
Roberts M. J., . (1995). Collins Field Guide to Spiders of Britain & Northern Europe. : .
Chicago
Roberts Michael J, . 1995. Collins Field Guide to Spiders of Britain & Northern Europe. : .
Harvard
Roberts M. J., . (1995). Collins Field Guide to Spiders of Britain & Northern Europe. : .
MLA
Roberts Michael J, . Collins Field Guide to Spiders of Britain & Northern Europe. : . 1995.