อ้างอิง ของ โซปแลนด์

  1. ↑ Boye Lafayette De Mente, Sex and the Japanese: The Sensual Side of Japan, (Rutland, Vermont: Tuttle Publishing, 2006), 58.
  2. 1 2 Peter Constantine, Japan's Sex Trade: A Journey Through Japan's Erotic Subcultures, (Tokyo: Yenbooks, 1993), 37–8.