Boys, C. V. (1959). Sopa bubbles and the forces which mould them. Doubleday Anchor Books.
Citazione stile Chigago Style (17a edizione)Boys, Charles Vernon. Sopa Bubbles and the Forces Which Mould Them. Nueva York: Doubleday Anchor Books, 1959.
Citatione MLA (9a ed.)Boys, Charles Vernon. Sopa Bubbles and the Forces Which Mould Them. Doubleday Anchor Books, 1959.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.