Churkin, M., & Carter, C. (1970). Early Silurian graptolites from southeastern Alaska and their correlation with graptolitic sequences in North America and the Arctic: Descriptions and illustrations of 59 species of Graptoloidea and correlation of the assemblages with other graptolitic successions in North America, the Soviet Arctic, and Great Britain. US Gov. Print. Off.
Chicago-Zitierstil (17. Ausg.)Churkin, Michael, und Claire Carter. Early Silurian Graptolites from Southeastern Alaska and Their Correlation with Graptolitic Sequences in North America and the Arctic: Descriptions and Illustrations of 59 Species of Graptoloidea and Correlation of the Assemblages with Other Graptolitic Successions in North America, the Soviet Arctic, and Great Britain. Washington, D.C: US Gov. Print. Off, 1970.
MLA-Zitierstil (9. Ausg.)Churkin, Michael, und Claire Carter. Early Silurian Graptolites from Southeastern Alaska and Their Correlation with Graptolitic Sequences in North America and the Arctic: Descriptions and Illustrations of 59 Species of Graptoloidea and Correlation of the Assemblages with Other Graptolitic Successions in North America, the Soviet Arctic, and Great Britain. US Gov. Print. Off, 1970.