[MSDN Library April 2000] PSP.EXE 3.1 or Earlier May Causes Windows 3.1 to Fail (53.3862433862434%)

MSDN Library - April 2000 > Knowledge Base > Windows > Windows 95.x Retail Product

[MSDN Library September 1992] PSP (13.7382596800294%)

Books and Magazine Articles > MS-DOS Programmer's Reference > Chapter 5 Program Management > 5.8 Structures