His Software engineering, 1982: CIP t.p. (I. Sommerville) CIP data sheet (b. 2/23/51)
LC database, Mar. 8, 1999 (hdg.: Sommerville, Ian; usage: Ian Sommerville, I. Sommerville)
Engineering software products, 2020: title page (Ian Sommerville)
Ian Sommerville personal website, viewed March 24, 2022 (Ian Sommerville lives in Edinburgh, Scotland. He was Professor of Software Engineering at Lancaster University (1986-2006) and at St Andrews University (2006-2014). He likes photography. Email: iansommerville@gmail.com) https://iansommerville.com/