For a popular magazine article, try this one.
Rulers of the Jurassic Seas. by Ryosuke Motani. Scientific American,
December 2000, pp. 52-59. You can find the summary of the article at the Scientific American
Also, this book, although a decade old, is still the best book on
ichthyosaurs. It is available in papaerbacks.
Dinosaurs, Spitfires, and Sea Dragons. by Chris McGowan. Harvard
University Press, 1991.
A classical book on marine reptiles by Williston is available on the web.
It is outdated, but still a good read.
Water Reptiles of the Past and Present. by Samuel Wendell Willistion.
University of Chicago Press, 1914. It is available for free from the website
There are so many scientific papers on ichthyosaurs. Rather than listing
all of them on this page, here
is a file containing an Endnote3.0 library for the ichthyosaurian
literature (120 kb, zipped). You will find 870 entries in the file, but
there must be some duplicate listings that I failed to delete, decreasing
the actual number. The list is by no means exhaustive, and you should
check for the latest publications yourself. Also, I am unable to provide
photocopies of the listed articles.