Jackie Gaff. (2003). Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books.
Cita Chicago (17th ed.)Jackie Gaff. Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books, 2003.
Cita MLA (9th ed.)Jackie Gaff. Stalactites Hang Down: And Other Questions About Caves (I Wonder Why) (I Wonder Why Series). Kingfisher Books, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.