Volume 2 of "Sources of Japanese Tradition" covering 1600 to 2000 compiled by WM. Theodore de Bary and others has a section of translated sources about the Akō incident (commonly known as 47-rōnin). The vast majority of them are various philosopher and other people's take on the incident.

Note the various different takes on the incident.

Though not a primary source, Oleg Benesch's explanation of the incident and it's place in Japanese history/society/philosophy in "Inventing the Way of the Samurai: Nationalism, Internationalism, and Bushido in Modern Japan" is also a good read.

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