Blyton, E. (1942). The O'Sullivan Twins At St. Clare's (75th.). Hodder Children's Books.
Citazione stile Chigago Style (17a edizione)Blyton, Enid. The O'Sullivan Twins At St. Clare's. 75th. London: Hodder Children's Books, 1942.
Citatione MLA (9a ed.)Blyton, Enid. The O'Sullivan Twins At St. Clare's. 75th. Hodder Children's Books, 1942.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.