<HTML>The article about the Still appeared in "Stationary Power" No.5, "The Journal of the Stationary Engine Research Group" 1988. This is a journal, rather than a book, published annually.
Article title was "W.J.Still and the ideal marine engine" by M.C.Duffy
You may be able to purchase copies from ISSES, see link below.
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www.steamenginesociety.org]
I wouldn't get too excited about the Still cycle, the author of the article concludes that although it was well thought out, it was too complex to suceed. At the same time heavy oil marine engines were being improved in reliability and economy, thus dooming the Still. Also diesel electrics became available for locomotives, so there was no need for the Still.</HTML>