Dyfyniad APA
Leavitt, D. (1987). The lost language of cranes. Penguin books.
Dyfyniad Arddull Chicago
Leavitt, David. The Lost Language of Cranes. London: Penguin books, 1987.
Dyfyniad MLA
Leavitt, David. The Lost Language of Cranes. Penguin books, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.