APA

Olsen S. J., Chen M., Liu Y., Witschi M., Ardoin A., Calba C., Mathieu P., Masserey V., Maraglino F., Marro S., Penttinen P., Robesyn E. & Pukkila J. (20200630). Early Introduction of Severe Acute Respiratory Syndrome Coronavirus 2 into Europe. : Emerging infectious diseases.

Chicago

Olsen Sonja J, Chen Meng-Yu, Liu Yu-Lun, Witschi Mark, Ardoin Alexis, Calba Clémentine, Mathieu Pauline, Masserey Virginie, Maraglino Francesco, Marro Stefano, Penttinen Pasi, Robesyn Emmanuel and Pukkila Jukka. 20200630. Early Introduction of Severe Acute Respiratory Syndrome Coronavirus 2 into Europe. : Emerging infectious diseases.

Harvard

Olsen S. J., Chen M., Liu Y., Witschi M., Ardoin A., Calba C., Mathieu P., Masserey V., Maraglino F., Marro S., Penttinen P., Robesyn E. and Pukkila J. (20200630). Early Introduction of Severe Acute Respiratory Syndrome Coronavirus 2 into Europe. : Emerging infectious diseases.

MLA

Olsen Sonja J, Chen Meng-Yu, Liu Yu-Lun, Witschi Mark, Ardoin Alexis, Calba Clémentine, Mathieu Pauline, Masserey Virginie, Maraglino Francesco, Marro Stefano, Penttinen Pasi, Robesyn Emmanuel and Pukkila Jukka. Early Introduction of Severe Acute Respiratory Syndrome Coronavirus 2 into Europe. : Emerging infectious diseases. 20200630.