APA (7th ed.) Citation

Gutiérrez y Muhs, G., Vega, G., & Muhs, E. (1990). Un libro de plástico =: A plastic book : an interactive book of poetry. [publisher not identified].

Chicago Style (17th ed.) Citation

Gutiérrez y Muhs, Gabriella, Graciela Vega, and Eric Muhs. Un Libro De Plástico =: A Plastic Book : An Interactive Book of Poetry. [Place of publication not identified]: [publisher not identified], 1990.

MLA (9th ed.) Citation

Gutiérrez y Muhs, Gabriella, et al. Un Libro De Plástico =: A Plastic Book : An Interactive Book of Poetry. [publisher not identified], 1990.