APA (7e ed.) Bronvermelding

Ries Al. (2017). Positioning: The Battle For Your Mind (20.). McGraw Hill Education.

Chicago (17e ed.) Bronvermelding

Ries Al. Positioning: The Battle For Your Mind. 20. Chennai: McGraw Hill Education, 2017.

MLA (9e ed.) Bronvermelding

Ries Al. Positioning: The Battle For Your Mind. 20. McGraw Hill Education, 2017.

Let op: Deze citaties zijn niet altijd 100% accuraat.