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Classics
Quoting classics was an inescapable reality of Chinese political and academic life as early as the Eastern Zhou period. Pei Songzhi often cites classics in order to contextualize quotations made by speakers in Chen Shou's original text, and occasionally to explain the philosophy or background behind a person's actions. These works do not constitute historical sources for Pei Songzhi's purposes, but are included here for sake of completeness.

Other Sources
Pei Songzhi occasionally quotes other historians without citing any book or document title. Sun Sheng and Xi Zuochi (習鑿齒) are especially common. These may have been marginal notes in Pei's copy of Records of the Three Kingdoms, or personal notes to which he had access. Rarely, Pei Songzhi will report hearsay without any attribution.