ISBN-13: 9780415854719 / Angielski / Miękka / 2013 / 172 str.
ISBN-13: 9780415854719 / Angielski / Miękka / 2013 / 172 str.
"First published in 1916; English edition first published in the United Kingdom 1920 by Methuen First published by Routledge 1993."