Shrock. (1953). Principles of invertabrate paleontology. Mc Graw Hill.
Chicago Edition CitationShrock. Principles of Invertabrate Paleontology. Mc Graw Hill, 1953.
MLA Edition CitationShrock. Principles of Invertabrate Paleontology. Mc Graw Hill, 1953.
Warning: These citations may not always be 100% accurate.