The most reliable source is . Search for "Garuda Purana Odia" where scanned copies of the 1950s S.C. Das publications are available. These are legal and in public domain.
: Beyond death, it discusses righteous living, ethics, and even dietary rules (such as the consequences of consuming specific foods). Accessing the Garuda Purana Odia PDF
: Instructions on the proper performance of cremation and post-death rituals to ensure the soul's peace.