Nathan's
The Computer Boys Take Over is a great resource for the changing vocabulary related to software construction in the 1960s and the institutional and professional power that came with new titles and roles.
If you're interested in how the story continues into the era of PCs, my new book Code Nation: Personal Computing and the Learn to Program Movement in America (ACM Books, 2020) explores the wide range of people who experimented with or claimed programmer status in the 1970s, 80s, and 90s in America's programming communities. This includes professional software engineers in emerging tech companies but also the hobbyists, educators, students, gamers, hackers, writers, and everyday citizens who created or modified software but didn't use the traditional labels.
A backdrop of my book's presentation are the computer literacy debates of the era, and a number of the historic languages and tools, but you'll also see how people learned to write code for new platforms such as CP/M, MS-DOS, Unix/Xenix, Windows, and the Apple Macintosh.
All the best,
Michael Halvorson, Ph.D.