APA (7th ed.) Citation

Douglas, S. G. (2011). The "Blackwood" Group Famous Scots Series. Project Gutenberg.

Chicago Style (17th ed.) Citation

Douglas, Sir George. The "Blackwood" Group Famous Scots Series. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Douglas, Sir George. The "Blackwood" Group Famous Scots Series. Project Gutenberg, 2011.

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