Put Spread Collar, Call Spread Collar - The complete book of option spreads and combinations
What Is a Protective Collar? | The Motley Fool
Option Strategies, Illustrated with Graphs and Examples: Ratio Spreads, Covered Calls, Protective Puts, Collars, Long and Short Straddles, Money and Time Spreads, Bullish and Bearish Spreads
What is a Collar Option Strategy? - Corporate Finance Institute
Collar Options Strategy | Collar Options - The Options Playbook