The Decline in Male Fertility - WSJ

Decline in Human Fertility Rates with Male Age: A Consequence of a Decrease in Male Fecundity with Aging?

Male fertility takes a hit

The Sperm-Count 'Crisis' Doesn't Add Up - The New York Times

The global fertility collapse - Niskanen Center

Opinion Are Men the Overlooked Reason for the Fertility Decline? - The New York Times

Why Western men have suffered a 50% decline in sperm count over four decades - MarketWatch

Are Sperm Counts Really Declining?

What I Wish I Had Known About Fertility Challenges + Getting Pregnant Despite the Odds – Healthybaby

Charted: The Global Decline of Fertility Rates

Men's fertility declines with age