Tsuchiura Shishi Hensan Iinkai

• Irokawa Minaka kankei shiryō mokuroku
• Mura meisaichō
• Tsuchiura shishi bekkan Tsuchiura rekishi chizu
• Tsuchiura shishi henshū shiryō
• Zusetsu Tsuchiura no rekishi
• 土浦市史