Gaya APA

Eicher, D, L., McAlester, A, L. (1980). History of the earth . Englewood Cliffs, New Jersey: Prentice Hall Inc.

Gaya MLA

Eicher, Don, L.., McAlester, A., Lee.. "History of the earth". Englewood Cliffs, New Jersey: Prentice Hall Inc, 1980. Printed Book.