APA (7th ed.) Citation

Holdridge, L. R. (1969). Quasi-stellar objects in a cyclic universe. Tropical Science Center.

Chicago Style (17th ed.) Citation

Holdridge, L. R. Quasi-stellar Objects in a Cyclic Universe. San Jose, Costa Rica: Tropical Science Center, 1969.

MLA (9th ed.) Citation

Holdridge, L. R. Quasi-stellar Objects in a Cyclic Universe. Tropical Science Center, 1969.