Cita APA (7a ed.)

Gerola, H., Salem, M., & Panagia, N. (1971). The hydrogen line spectrum of gaseous nebulae.

Cita Chicago Style (17a ed.)

Gerola, H., M. Salem, y N. Panagia. The Hydrogen Line Spectrum of Gaseous Nebulae. 1971.

Cita MLA (8a ed.)

Gerola, H., et al. The Hydrogen Line Spectrum of Gaseous Nebulae. 1971.