Humphreys, A. L. (2009). The Private Library What We Do Know, What We Don't Know, What We Ought to Know About Our Books. Project Gutenberg.
Chicago Style (17th ed.) CitationHumphreys, Arthur Lee. The Private Library What We Do Know, What We Don't Know, What We Ought to Know About Our Books. Project Gutenberg, 2009.
MLA (9th ed.) CitationHumphreys, Arthur Lee. The Private Library What We Do Know, What We Don't Know, What We Ought to Know About Our Books. Project Gutenberg, 2009.
Warning: These citations may not always be 100% accurate.