Ries Al. (2017). Positioning: The Battle For Your Mind (20.). McGraw Hill Education.
Citazione stile Chigago Style (17a edizione)Ries Al. Positioning: The Battle For Your Mind. 20. Chennai: McGraw Hill Education, 2017.
Citatione MLA (9a ed.)Ries Al. Positioning: The Battle For Your Mind. 20. McGraw Hill Education, 2017.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.