Παραπομπή σε μορφή APA (7η εκδ.)

Duggal, K. L., & Sharma, R. C. (1999). Symmetries of spacetimes and Riemannian manifolds. Kluwer Academic Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Duggal, Krishan L., και Ramesh Chandra Sharma. Symmetries of Spacetimes and Riemannian Manifolds. Dordrecht ; Boston: Kluwer Academic Publishers, 1999.

Παραπομπή σε μορφή MLA (8th εκδ.)

Duggal, Krishan L., και Ramesh Chandra Sharma. Symmetries of Spacetimes and Riemannian Manifolds. Kluwer Academic Publishers, 1999.