A Prince Valiant Companion (Manuscript Press, 1992), by Todd Goldberg and Carl J. Horak, was edited by Markstein and Rick Norwood.
Don Quixote | Don Giovanni | Don Cherry | Don | Don (honorific) | Don Cheadle | Rostov-on-Don | Don Williams | Don Juan | Don Knotts | Don Imus | Don Carlos | Don Rickles | Don Omar | Don Henley | Salesians of Don Bosco | Don Johnson | Don Drysdale | Don Pasquale | Don Messick | Don Bluth | Don King (boxing promoter) | Don King | Don Shula | Don LaFontaine | Don Cherry (jazz) | Don Burrows | Don't Look Now | Don Siegel | Don McLean |
Though produced in Denmark, these Horace stories were written by Americans: Stefan Petrucha, Sarah Kinney, and Don Markstein.