LADYBIRD BOOKS. (2020). PEPPA PIG: PEPPA LOVES OUR PLANET. LADYBIRD BOOKS.
芝加哥风格引文LADYBIRD BOOKS. PEPPA PIG: PEPPA LOVES OUR PLANET. UK: LADYBIRD BOOKS, 2020.
MLA引文LADYBIRD BOOKS. PEPPA PIG: PEPPA LOVES OUR PLANET. LADYBIRD BOOKS, 2020.
警告：这些引文格式不一定是100％准确.