1. Aoyagi, K. (1896). Mitsubachi [The honeybee]. Nougyou-sya Press. (in Japanese).
2. Aoyagi, K. (1904). Youhou Zensho [The complete book of beekeeping] (1st ed.) Hakone Youhou-jou Press. (in Japanese).
3. Aoyagi, K. (1913). Jikken Youhou Mondou [Experimental beekeeping question and answer]. Hakone Youhou-jou Press. (in Japanese).
4. Aoyagi, K. (1914). Youhou Zensho [The complete book of beekeeping] (12th ed.). Hakone Youhou-jou Press. (in Japanese).