Bode, Carl, ed., The Portable Thoreau, The Viking Press, 1965.

This work includes Walden, A Week on the Concord
and Merrimack Rivers
, eighteen poems, and several
essays and journal entries. Bode presents Thoreau's
work, as well as the controversies of Thoreau's life
in this comprehensive collection.

Cameron, Kenneth Walter, Young Emerson's Transcendental Vision: An Exposition of His World View with an Analysis of the Structure, Backgrounds and Meaning of "Nature," Transcendentalist Books, 1971.

This books provides a wealth of information about
Transcendentalism and Emerson's relationship to it.
It also includes a reprinting of works by authors relevant
to Emerson's work, such as British romantic
poet Samuel Taylor Coleridge.

Chai, Leon, The Romantic Foundations of the American Renaissance, Cornell University Press, 1987.

This work discusses the influence of European Romanticism
on the authors of the American Renaissance, including
German and British writers and philosophers.

Myerson, Joel, The New England Transcendentalists...