International Penguin Class Dinghy Association (5 August 2020). "Penguin Plans". penguinclass.com. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Penguin Class". sailboat.guide. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
penguinclass.com
International Penguin Class Dinghy Association (5 August 2020). "Penguin Plans". penguinclass.com. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
sailboat.guide
Sea Time Tech, LLC (2022). "Penguin". sailboat.guide. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Philip Rhodes". sailboat.guide. Archived from the original on 30 December 2021. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Schock W.D."sailboat.guide. Archived from the original on 23 December 2021. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Helms - Jack A. Helms Co". sailboat.guide. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Rawson (Ron Rawson, Inc.)". sailboat.guide. Archived from the original on 8 August 2022. Retrieved 8 August 2022.
Sea Time Tech, LLC (2022). "Customflex". sailboat.guide. Archived from the original on 8 August 2022. Retrieved 8 August 2022.