APA (7th ed.) Citation

Timberlake & Ziglar. (1999). It's always too soon to quit (Updated ed.). Advantage Quest Publs.

Chicago Style (17th ed.) Citation

Timberlake and Ziglar. It's Always Too Soon to Quit. Updated ed. Petaling Jaya: Advantage Quest Publs, 1999.

MLA (8th ed.) Citation

Timberlake and Ziglar. It's Always Too Soon to Quit. Updated ed. Advantage Quest Publs, 1999.