Russo, L. (2004). The succulent plants of Eastern Africa: Proceedings of the International Symposium: The succulent plants of Eastern Africa : history, botanical exploration and research, Verbania, 20 - 22 September 2002 = Le piante succulente dell'Africa orientale. Assoc. Italiana Amatori delle Piante Succulente.
Chicago-Zitierstil (17. Ausg.)Russo, Lucio. The Succulent Plants of Eastern Africa: Proceedings of the International Symposium: The Succulent Plants of Eastern Africa : History, Botanical Exploration and Research, Verbania, 20 - 22 September 2002 = Le Piante Succulente Dell'Africa Orientale. Roma: Assoc. Italiana Amatori delle Piante Succulente, 2004.
MLA-Zitierstil (9. Ausg.)Russo, Lucio. The Succulent Plants of Eastern Africa: Proceedings of the International Symposium: The Succulent Plants of Eastern Africa : History, Botanical Exploration and Research, Verbania, 20 - 22 September 2002 = Le Piante Succulente Dell'Africa Orientale. Assoc. Italiana Amatori delle Piante Succulente, 2004.