Zai chīfū Nihon Ryōjikan ... 1935 t.p. (Chih-fu) p. 2, 2nd group (Chih-fu shih)
Columbia Lippincott gazetteer of the world, 1966 (Chefoo, Chifu, or Chih-fou, officially Yentai or Yen-t‘ai, E. Shantung prov., China; port on Yellow Sea, on Shantung peninsula's coast; held by the Japanese, 1937-45, passed 1948 to Communist control)
Yen-t‘ai nien chien, 1992 t.p. (Yen-t‘ai shih jen min cheng fu; People's Government of Yantai [in rom.])