Lemke, Donald B. Super zero, 2009: ecip t.p. (Douglas Holgate)

Anderson, Brian. The adventures of Commander Zack Proton and the wrong planet, c2007: t.p. (illustrated by Doug Holgate)

The house of skullduggery Web site, Apr. 30, 2010 (Douglas Holgate; illustrator, cartoonist, philanthropist, improbable pundit, cultural attache; location: Australia; titles: Super zero, Zack Proton - The wrong planet)

Mason, Max. Guardians of the future, 2022 : title page (illustrated by Douglas Holgate)

Illustrators website, December 14, 2022 (Douglas Holgate ; illustrator ; lives in Victoria Australia)