- http://experiment.worldcat.org/entity/work/data/1922973334#Topic/mathematics_study_and_teaching_secondary_problems_exercises_etc
- http://experiment.worldcat.org/entity/work/data/1922973334#Topic/mathematics_study_and_teaching_secondary_textbooks
- http://experiment.worldcat.org/entity/work/data/1922973334#Topic/mathematics_study_and_teaching_secondary

- "Real world mathematics"@en