On the nature of things :
a philosophical poem, in six books /
Lucretius ; literally translated into English prose, by John Selby Watson ; to which is adjoined the poetical version of John Mason Good.

APA Citation

Lucretius Carus, T., Good, J. Mason., Watson, J. S. (John Selby). (1851). On the nature of things: a philosophical poem, in six books. London: Henry G. Bohn.

MLA Citation

Lucretius Carus, Titus, John Mason Good, and J. S. (John Selby) Watson. On the Nature of Things: a Philosophical Poem, In Six Books. London: Henry G. Bohn, 1851.

Warning: These citations may not always be complete (especially for serials).