APA (7th ed.) Citation

SPENCER, E. H. basic concepts of physical geology#Elizabeth humpris Spencer. Thomas Y Growel.

Chicago Style (17th ed.) Citation

SPENCER, Elizabeth Humphris. Basic Concepts of Physical Geology#Elizabeth Humpris Spencer. Thomas Y Growel.

MLA (8th ed.) Citation

SPENCER, Elizabeth Humphris. Basic Concepts of Physical Geology#Elizabeth Humpris Spencer. Thomas Y Growel.

Warning: These citations may not always be 100% accurate.