APA (7th ed.) Citation

Gorgas, J., Cardiel, N., & Pedraz, S. (1998). Towards an Understanding of the λ4000Å Break Behaviour in Old Stellar Populations. Springer.

Chicago Style (17th ed.) Citation

Gorgas, J., N. Cardiel, and S. Pedraz. Towards an Understanding of the λ4000Å Break Behaviour in Old Stellar Populations. Springer, 1998.

MLA (9th ed.) Citation

Gorgas, J., et al. Towards an Understanding of the λ4000Å Break Behaviour in Old Stellar Populations. Springer, 1998.