Amis, Kingsley, Introduction to Tennyson, Penguin Books, 1973, pp. 7-19.

Students who find scholarly work hard to follow will
appreciate Amis's brief examination of Tennyson's
life and importance. Amis, who could be one of the
funniest novelists of the twentieth century, seems an
unlikely choice for introducing Tennyson's poetry,
but his essay is reverent and warm.

Buckley, Jerome Hamilton, Tennyson: The Growth of a Poet, Harvard University Press, 1960.

Part biography and part criticism, this book gives
some insight into Tennyson's psychological state as
he wrote this poem.

Foakes, R. A., "The Commitment to Metaphor: Modern Criticism and Romantic Poetry," in British Romantic Poets: Recent Revelations, New York University Press, 1966, pp. 22-32.

Foakes does not specifically talk about Tennyson, but
he does talk about how Romanticism affected poetry
that came after it. Readers can draw conclusions
about where Tennyson fits into the scheme Foakes
proposes.

Hollander, John, "Tennyson's...