Police Quest series

References made to Police Quest series

 * In KQ4 (both AGI and SCI) there is a reference Police Quest and Lytton in the Glass Bottle.
 * In KQ4AGI there is a reference to Police Quest II and Jim Walls. ""Jim Walls is busy writing Police Quest II and not here."

Police Quest I

 * In Police Quest I EGA, The Lytton Tribune newspaper has an article about events of King's Quest III and the Three-Headed Dragon attacking Daventry, and mentions the gnome mentioning that the kingdom was in a 'state of emergency'.
 * Also in Police Quest I EGA, if you try to take a feather from the chicken on John Dooley's desk. The game comments; "Do that in \"King's Quest III.\"
 * The end of Police Quest plugs King's Quest I, II, and III.
 * In Police Quest II if the player does something crazy such as shooting gun haphazardly at civilians, a newspaper is shown with a picture of Graham mentioning that the "King is Near Death.
 * In Police Quest II King's Quest games information for the first 4 games can be found in the Crime Computer.

Other

 * Rosella's First Quest
 * The Bookwyrm Investigates: Sierra Characters' Favorite Books
 * Strategy and Tactics: Hoyle Volume 3