(美)弗里茨·吉尔伯特(Fritz Gilbert)著. (2023). 老后无忧：退休规划与心理健康指南：staying happy, active, and productive in your retired years. 中信出版集团.
Dyfyniad Arddull Chicago(美)弗里茨·吉尔伯特(Fritz Gilbert)著. 老后无忧：退休规划与心理健康指南：staying Happy, Active, and Productive in Your Retired Years. 中信出版集团, 2023.
Dyfyniad MLA(美)弗里茨·吉尔伯特(Fritz Gilbert)著. 老后无忧：退休规划与心理健康指南：staying Happy, Active, and Productive in Your Retired Years. 中信出版集团, 2023.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.