Gaya APA

Duffy, J, R. (2020). Motor Speech Disorders: Substrates, Differential Diagnosis, and Management 4th Edition (4). United State of America: Elsevier.

Gaya MLA

Duffy, Joseph, R.. "Motor Speech Disorders: Substrates, Differential Diagnosis, and Management 4th Edition". 4 United State of America: Elsevier, 2020. Text.