APA

Ashbrook P., . (2018). Science is simple. : Gryphon House Inc.

Chicago

Ashbrook Peggy, . 2018. Science is simple. : Gryphon House Inc.

Harvard

Ashbrook P., . (2018). Science is simple. : Gryphon House Inc.

MLA

Ashbrook Peggy, . Science is simple. : Gryphon House Inc. 2018.