Tolong jelaskan mengenai Penguin book covers dari Penguin Books dalam bahasa melayu

Penguin Cerise Travel Celebrating Penguin Books' early 'Travel and Adventure' series

Foley Collection — articles and extensive lists

History of the Penguin Archive by Toby Clements, The Telegraph, 19 February 2009.

Archival Material at Leeds University Library

Syarikat yang ditubuhkan pada 1935