1. Cooke, J. R.1972. An interpretation of the resonant behavior of intact fruits and vegetables. Trans. ASAE 15: 1075–1080.
2. Fumuro, M., N. Utsunomiya, K. Sasaki, K. Shimizu and S. Kanzaki. 2007. Relationship among fruit parameters and fruit growth affected by GA3 and CPPU in dragon fruit. Hort. Res. (Japan) 7 (Suppl. 1): 376 (In Japanese).
3. Inoue, H., Y. Awaguni and H. Ikemiya. 2001. Characteristics in pitaya fruit. Japan J. Trop. Agr. 45 (Suppl. 2): 7–8 (In Japanese).
4. Kataoka, I., S. Fukuda, N. Kozai, K. Beppu and Y. Yonemoto. 2006. Characteristics and conditions of seed germination of dragon fruit (Hylocereus undatus). J. Japan. Soc. Hor. Sci. 75 (Suppl. 1): 290 (In Japanese).
5. Kubo, Y. 2002. Shukakugo-no-kajitsu-no-toriatsukai. p. 195–217. In: F. Mizutani, S. Hiratsuka, K. Banno, N. Kubo, T. Ishii, A. Wakana, I. Kataoka, K. Yonemori, Y. Kubo and H. Yamada. Saishin-kajuengeigaku (In Japanese). Asakurashoten, Tokyo.