APA (7th ed.) Citation

Villar, I. d., Arregui, F. J., & Goicoechea, J. (2018). Solved Problems in Digital Electronics. Marcombo.

Chicago Style (17th ed.) Citation

Villar, Ignacio del, Francisco J. Arregui, and Javier Goicoechea. Solved Problems in Digital Electronics. Barcelona: Marcombo, 2018.

MLA (9th ed.) Citation

Villar, Ignacio del, et al. Solved Problems in Digital Electronics. Marcombo, 2018.