SpringerLink (Online service) & Caldwell, D. (2019). Alexander L. George: A Pioneer in Political and Social Sciences: With a Foreword by Dan Caldwell (1st ed. 2019.). Springer International Publishing : Imprint: Springer. https://doi.org/10.1007/978-3-319-90772-7
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service) και Dan Caldwell. Alexander L. George: A Pioneer in Political and Social Sciences: With a Foreword by Dan Caldwell. 1st ed. 2019. Cham: Springer International Publishing : Imprint: Springer, 2019. https://doi.org/10.1007/978-3-319-90772-7.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service) και Dan Caldwell. Alexander L. George: A Pioneer in Political and Social Sciences: With a Foreword by Dan Caldwell. 1st ed. 2019. Springer International Publishing : Imprint: Springer, 2019. https://doi.org/10.1007/978-3-319-90772-7.
