Imlay, R. W. (1981). Early Jurassic ammonites from Alaska: Studies of Early Jurassic ammonites from Alaska provide close correlations with Lower Jurassic ammonite zones in Europe and with ammonite successions elsewhere in the world. US Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Imlay, Ralph W. Early Jurassic Ammonites from Alaska: Studies of Early Jurassic Ammonites from Alaska Provide Close Correlations with Lower Jurassic Ammonite Zones in Europe and with Ammonite Successions Elsewhere in the World. Washington: US Gov. Print. Off, 1981.
MLA-Zitierstil (9. Ausg.)Imlay, Ralph W. Early Jurassic Ammonites from Alaska: Studies of Early Jurassic Ammonites from Alaska Provide Close Correlations with Lower Jurassic Ammonite Zones in Europe and with Ammonite Successions Elsewhere in the World. US Gov. Print. Off, 1981.