Παραπομπή σε μορφή APA (7η εκδ.)

(2019). Self-Discipline: Develop Daily Habits to Program Your Mind, Build Mental Toughness, Self-Confidence and WillPower. Independently Published.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Self-Discipline: Develop Daily Habits to Program Your Mind, Build Mental Toughness, Self-Confidence and WillPower. USA: Independently Published, 2019.

Παραπομπή σε μορφή MLA (9th εκδ.)

Self-Discipline: Develop Daily Habits to Program Your Mind, Build Mental Toughness, Self-Confidence and WillPower. Independently Published, 2019.