《宋史·列传·卷一百五十》
何澹对周必大不满而感激留正，到他为谏长时，于是首先弹劾周必大。
澹憾必大而德正，至是为谏长，遂首劾必大。
He Dan was both dissatisfied with Zhou Bida and grateful to Liu Zheng. When he became a remonstrator, he immediately impeached Zhou Bida.