APA (7th ed.) Citation

Johnson, C. N. (2007). The preface to Darwin's "Origin of Species": The curious history of the "Historical Sketch".

Chicago Style (17th ed.) Citation

Johnson, Curtis Neal. The Preface to Darwin's "Origin of Species": The Curious History of the "Historical Sketch". 2007.

MLA (9th ed.) Citation

Johnson, Curtis Neal. The Preface to Darwin's "Origin of Species": The Curious History of the "Historical Sketch". 2007.

Warning: These citations may not always be 100% accurate.