Andrews, Tom, ed., On William Stafford: The Worth of Local Things, University of Michigan Press, 1993.

Several contemporary poets, including Margaret Atwood,
Richard Hugo, Linda Pastan, and Charles
Simic, contributed essays to this generally positive
collection about Stafford's career.

Capps, Donald, The Poet's Gift: Toward the Renewal of Pastoral Care, Westminster/John Knox Press,1993.

This analysis from a theological perspective looks at
poetry from Stafford and Denise Levertov to make
the case for spirituality in modern literature.

Carpenter, David A., William Stafford, Boise State University Press, 1986.

At just over fifty pages, this brief survey of the poet's
life up to that time was part of the university's "Western
Writers" series.

Marshall, Gary Thomas, William Stafford: A Writer Writing, Southern Illinois University at Carbondale, 1990.

Marshall's Ph.D. dissertation analyzing Stafford's
career is available on the Internet and also on microfilm
from Southern Illinois University.

Pinsker, Sanford, Three Pacific...