His Spark ignition engine simulation, 1986: t.p. (C. Borgnakke)

University of Michigan. Directory, 1989-90 (Borgnakke, Claus)

Fundamentals of thermodynamics, 2025: CIP title page (Claus Borgnakke)

ORCID, December 6, 2025 (Claus Borgnakke; PhD in mechanical engineering from Technical University of Denmark)