These are links to some of the classic writing on advertising and marketing, they are a little old and are in the public domain free for you to enjoy. And just as relevant today as they were when first published.
Ogilvy on Advertising — by David Ogilvy (1983)
Scientific Advertising — by Claude C. Hopkins (1921)
The essentials of advertising — by Frank Leroy Blanchard (1921)
Advertising, its principles and practice — by Harry Tipper (1919)
Better advertising; a practical manual of the principles of advertising — by John Manly (1921)
Effective direct advertising; the principles and practice of producing direct advertising for distribution by mail or otherwise — by Robert E. Ramsay (1888)