QST Magazine 1915 – 1969: https://www.worldradiohistory.com/QST.htm
ARRL Handbooks: https://www.worldradiohistory.com/BOOKSHELF-ARH/Bookshelf_ARRL.htm
VE7SL Radio Notebook: https://www.qsl.net/ve7sl/
6C4-5763 transmitter by WB8DQT: www.arrl.org/files/file/QST%20Binaries/Jan2012/w1ts_project.pdf
