APA (7th ed.) Citation

Ahmad Kassim. How To Write Effective Business Letters. Synergy Books International.

Chicago Style (17th ed.) Citation

Ahmad Kassim. How To Write Effective Business Letters. Kuala Lumpur: Synergy Books International.

MLA (9th ed.) Citation

Ahmad Kassim. How To Write Effective Business Letters. Synergy Books International.

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