旁征博引

páng zhēng bó yǐn

to quote widely in support

Character by character

旁páng
widely

征zhēng
cite

博bó
broadly

引yǐn
quote

他的文章旁征博引，很有说服力。

His writing draws on a wide range of sources and is very persuasive.

Tone: positive (praise).

Praise for writing or speeches rich in references.

Learn it in context

This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.