Khitroumnyĭ idalʹgo Don Kikhot Lamanchskiĭ

Widely regarded as the world's first modern novel, Don Quixote chronicles the famous picaresque adventures of the noble knight-errant Don Quixote de La Mancha and his faithful squire, Sancho Panza, as they travel through sixteenth-century Spain. [Translated by John Ormsby.]

This book includes both parts.

The first part was originally published in 1605, see El ingenioso hidalgo don Quijote de la Mancha The second part was published in 1615, see Segunda parte del ingenioso caballero don Quijote de la Mancha