APA (7th ed.) Citation

Dalessio, D. J. (1971). Proceedings of the International Headache Symposium: [held at] Elsinore, Denmark, 16th to 18th May 1971. Sandoz.

Chicago Style (17th ed.) Citation

Dalessio, Donald J. Proceedings of the International Headache Symposium: [held at] Elsinore, Denmark, 16th to 18th May 1971. Basle, Switzerland: Sandoz, 1971.

MLA (9th ed.) Citation

Dalessio, Donald J. Proceedings of the International Headache Symposium: [held at] Elsinore, Denmark, 16th to 18th May 1971. Sandoz, 1971.