Citação norma APA

Gaul, C., Brömstrup, J., Fritsche, G., Diener, H. C., & Katsarava, Z. (2011). Evaluating integrated headache care: A one-year follow-up observational study in patients treated at the Essen headache centre. BioMed Central.

Citação norma Chicago

Gaul, Charly, Julia Brömstrup, Günther Fritsche, Hans C. Diener, and Zaza Katsarava. Evaluating Integrated Headache Care: A One-year Follow-up Observational Study in Patients Treated At the Essen Headache Centre. BioMed Central, 2011.

Citação norma MLA

Gaul, Charly, et al. Evaluating Integrated Headache Care: A One-year Follow-up Observational Study in Patients Treated At the Essen Headache Centre. BioMed Central, 2011.

Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.