Gaya APA

Robbins, L., Lang, S, S. (2000). Headache Help_ A Complete Guide to Understanding Headaches and the Medications That Relieve Them ( PDFDrive ) . Boston: Houghton Mifflin Company.

Gaya MLA

Robbins, Lawrence., Lang, Susan, S.. "Headache Help_ A Complete Guide to Understanding Headaches and the Medications That Relieve Them ( PDFDrive )". Boston: Houghton Mifflin Company, 2000. Elektronik/Digital.