Cita APA (7th ed.)

Harkness, R. (1991). Drug interactions guide book. Prentice Hall.

Cita Chicago (17th ed.)

Harkness, Richard. Drug Interactions Guide Book. Englewood Cliffs, NJ: Prentice Hall, 1991.

Cita MLA (9th ed.)

Harkness, Richard. Drug Interactions Guide Book. Prentice Hall, 1991.