Παραπομπή APA

Walters, T., & Osborne, R. Cycad classification: Concepts and recommendations.

Παραπομπή Chicago Style

Walters, Terrence, και Roy Osborne. Cycad Classification: Concepts and Recommendations.

Παραπομπή MLA

Walters, Terrence, και Roy Osborne. Cycad Classification: Concepts and Recommendations.