APA Style

Shrock, Robert R., Twenhofel, William H.. (1953). PRINCIPLES OF INVERTEBRATE PALEONTOLOGY SECOND EDITON (2nd). New York,Toronto, London, & To: McGRAW-HILL BOOK COMPANY, INC, & KOGAKUSHA COMPANY, LTD..

Chicago Style

Shrock, Robert R., Twenhofel, William H.. PRINCIPLES OF INVERTEBRATE PALEONTOLOGY SECOND EDITON. 2nd New York,Toronto, London, & To: McGRAW-HILL BOOK COMPANY, INC, & KOGAKUSHA COMPANY, LTD., 1953. Text.

MLA Style

Shrock, Robert R., Twenhofel, William H.. PRINCIPLES OF INVERTEBRATE PALEONTOLOGY SECOND EDITON. 2nd New York,Toronto, London, & To: McGRAW-HILL BOOK COMPANY, INC, & KOGAKUSHA COMPANY, LTD., 1953. Text.

Turabian Style

Shrock, Robert R., Twenhofel, William H.. PRINCIPLES OF INVERTEBRATE PALEONTOLOGY SECOND EDITON. 2nd New York,Toronto, London, & To: McGRAW-HILL BOOK COMPANY, INC, & KOGAKUSHA COMPANY, LTD., 1953. Print.