APA (7th ed.) Citation

Graupp, P., & Wrona, R. (2017). The TWI Workbook, 2nd Edition (2nd edition.). Productivity Press.

Chicago Style (17th ed.) Citation

Graupp, Patrick, and Robert Wrona. The TWI Workbook, 2nd Edition. 2nd edition. Productivity Press, 2017.

MLA (9th ed.) Citation

Graupp, Patrick, and Robert Wrona. The TWI Workbook, 2nd Edition. 2nd edition. Productivity Press, 2017.

Warning: These citations may not always be 100% accurate.