Annotations to The Complete Peanuts: 1979 to 1980 by Charles M. Schulz (Fantagraphics Books, 2011. ISBN 1606994387)
- p. 139 (November 20, 1979). Although common today thanks to personal computers, writing in more than one typeface was not generally possible with typewriters. Only high-end typewriters would offer that feature.
- p. 230 (June 21, 1980). In the United States as in many other countries, the end of the 1970s had seen a new phenomenon that generated much media interest: religious groups and cults supported by strong public relations and marketing strategies. The secular population, as well as Christian churches and individuals that were rather "mainstream" (like Schulz himself), generally disapproved of those organisations. The comments offered in previous strips respectively by the intellectual wing and the street-smart wing of the Peanuts gang epitomize that disapproval.