Symposium on Our Environment Singapur. (1991). Fourth Symposium on Our Environment: Proceedings of the Fourth Symposium on Our Environment, held in Singapore, May 21 - 23, 1990. Kluwer.
Chicago-Zitierstil (17. Ausg.)Symposium on Our Environment Singapur. Fourth Symposium on Our Environment: Proceedings of the Fourth Symposium on Our Environment, Held in Singapore, May 21 - 23, 1990. Dordrecht u.a: Kluwer, 1991.
MLA-Zitierstil (9. Ausg.)Symposium on Our Environment Singapur. Fourth Symposium on Our Environment: Proceedings of the Fourth Symposium on Our Environment, Held in Singapore, May 21 - 23, 1990. Kluwer, 1991.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.