Naturalis historia
(lat.)
at Penelope University Chicago
[penelope.uchicago.edu/Thayer/E/Roman/Texts/Pliny_the_Elder/home.html]

Naturalis historia
(lat. ed.: K.F.T. Mayhoff)
at Perseus
[www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus:text:1999.02.0138:toc]

Naturalis historia
(engl. ed.: J. Bostock, H.T. Riley, 1855)
at Perseus
[www.perseus.tufts.edu/cgi-bin/ptext?lookup=Plin.+Nat.+toc]