Livro - 7 December 1941 / The air force story

7 December 1941 / The air force story - 1991

http://www.avia-it.com/act/biblioteca/libri/PDF_Libri_By_Air_Force_Historical_Studies_Office/ORANGE/7_december_1941.pdf

Model Aviation - Setembro 1982

Model Aviation - Setembro 1982

http://library.modelaviation.com/ma/1982/9

Popular Mechanics - Março 1985

Popular Mechanics -  Março 1985

https://books.google.pt/books?id=YOQDAAAAMBAJ&printsec=frontcover&hl=pt-PT&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=true

Popular Aviation / Flying - Abril 1948

Popular Aviation / Flying - Abril 1948

https://books.google.pt/books?id=duo0UaTlaQ4C&printsec=frontcover&hl=pt-PT&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=true

Artigo - Understanding Thermal Soaring Sailplanes - Martin Simmons

Understanding Thermal Soaring Sailplanes - Martin Simmons - 1990

http://www.rcsoaringdigest.com/Supplements/Simons_UTSS.pdf