Sarah Courtauld. (2019). Owls (First Reading Level 4). Usborne.
Cita Chicago (17th ed.)Sarah Courtauld. Owls (First Reading Level 4). Usborne, 2019.
Cita MLA (9th ed.)Sarah Courtauld. Owls (First Reading Level 4). Usborne, 2019.
Atenció: Aquestes cites poden no estar 100% correctes.