APA (7th ed.) Citation

Ridley, M. (2020). Optimis Rasional. Gramedia Pustaka Utama.

Chicago Style (17th ed.) Citation

Ridley, Matt. Optimis Rasional. Gramedia Pustaka Utama, 2020.

MLA (8th ed.) Citation

Ridley, Matt. Optimis Rasional. Gramedia Pustaka Utama, 2020.

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