Poole, D. (2010). Linear Algebra: A Modern Introduction (in Dutch). Cengage Learning. p. 411. ISBN 978-0-538-73545-2. Retrieved 12 November 2018. 978-0-538-73545-2 ↩
Seymour Lipschutz 3000 Solved Problems in Linear Algebra. /wiki/Seymour_Lipschutz ↩