APA (7th ed.) Citation

Hampton, J. R., & Hampton, J. (2019). The ECG made easy (Ninth edition.). Elsevier.

Chicago Style (17th ed.) Citation

Hampton, John R., and Joanna Hampton. The ECG Made Easy. Ninth edition. Edinburgh ; New York: Elsevier, 2019.

MLA (9th ed.) Citation

Hampton, John R., and Joanna Hampton. The ECG Made Easy. Ninth edition. Elsevier, 2019.