APA
Ostkirchen G. G., Andler F., Hammer F., Pöhler K. D., Snyder-Schendel E., Werner N. K., Markett S., Horacek U., Jöckel K. & Diener H. C. (20090513). Prevalences of primary headache symptoms at school-entry: a population-based epidemiological survey of preschool children in Germany. : The journal of headache and pain.
Chicago
Ostkirchen Gabriele Gerda, Andler Felix, Hammer Friederike, Pöhler Kerstin Daniela, Snyder-Schendel Erika, Werner Nina Kerstin, Markett Sebastian, Horacek Ulrike, Jöckel Karl-Heinz and Diener Hans Christoph. 20090513. Prevalences of primary headache symptoms at school-entry: a population-based epidemiological survey of preschool children in Germany. : The journal of headache and pain.
Harvard
Ostkirchen G. G., Andler F., Hammer F., Pöhler K. D., Snyder-Schendel E., Werner N. K., Markett S., Horacek U., Jöckel K. and Diener H. C. (20090513). Prevalences of primary headache symptoms at school-entry: a population-based epidemiological survey of preschool children in Germany. : The journal of headache and pain.
MLA
Ostkirchen Gabriele Gerda, Andler Felix, Hammer Friederike, Pöhler Kerstin Daniela, Snyder-Schendel Erika, Werner Nina Kerstin, Markett Sebastian, Horacek Ulrike, Jöckel Karl-Heinz and Diener Hans Christoph. Prevalences of primary headache symptoms at school-entry: a population-based epidemiological survey of preschool children in Germany. : The journal of headache and pain. 20090513.