Gilbert, I. (2014). Independent thinking. Independent Thinking Press.
Citazione stile Chigago Style (17a edizione)Gilbert, Ian. Independent Thinking. Carmarthen, Wales: Independent Thinking Press, 2014.
Citatione MLA (9a ed.)Gilbert, Ian. Independent Thinking. Independent Thinking Press, 2014.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.