APA

Horrigan P. A., . (1970). The challenge of chemistry. New York: McGraw-Hill.

Chicago

Horrigan Philip A, . 1970. The challenge of chemistry. New York: McGraw-Hill.

Harvard

Horrigan P. A., . (1970). The challenge of chemistry. New York: McGraw-Hill.

MLA

Horrigan Philip A, . The challenge of chemistry. New York: McGraw-Hill. 1970.