Παραπομπή σε μορφή APA (7η εκδ.)

Kragh, H. (2016). Varying Gravity: Dirac’s Legacy in Cosmology and Geophysics (1st ed. 2016.). Springer International Publishing : Imprint: Birkhäuser.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Kragh, Helge. Varying Gravity: Dirac’s Legacy in Cosmology and Geophysics. 1st ed. 2016. Cham: Springer International Publishing : Imprint: Birkhäuser, 2016.

Παραπομπή σε μορφή MLA (8th εκδ.)

Kragh, Helge. Varying Gravity: Dirac’s Legacy in Cosmology and Geophysics. 1st ed. 2016. Springer International Publishing : Imprint: Birkhäuser, 2016.