APA (7e ed.) Bronvermelding

Spencer, H. Essays: Scientific, Political, & Speculative; Vol. 2 of 3 Library Edition (1891), Containing Seven Essays not before Republished, and Various other Additions.

Chicago (17e ed.) Bronvermelding

Spencer, Herbert. Essays: Scientific, Political, & Speculative; Vol. 2 of 3 Library Edition (1891), Containing Seven Essays Not Before Republished, and Various Other Additions.

MLA (9e ed.) Bronvermelding

Spencer, Herbert. Essays: Scientific, Political, & Speculative; Vol. 2 of 3 Library Edition (1891), Containing Seven Essays Not Before Republished, and Various Other Additions.