米国の研修医制度については、田中まゆみ氏の著書「ハーバードの医師づくり」（医学書院）を一部参考とさせていただきました。

、「」（）。

For information on the U.S. residency training system, I have partially referenced the book 'Harvard's Doctor-Making' by Mayumi Tanaka (published by Igaku-Shoin).

Literal

US [possessive-の] residency system [about-については], Tanaka Mayumi [possessive-の] book 'Harvard [possessive-の] doctor-making' (Igaku-Shoin) [object-を] partly reference [causative-とさせていただきました].

Formal acknowledgment/bibliography sentence. ~を参考とさせていただきました is maximally humble: させていただく (humble causative receiving) applied to 参考とする ('to use as reference'). 研修医制度 ('residency training system') is medical education vocabulary. 医学書院 is a real publisher of medical textbooks. The sentence models how to cite sources in formal Japanese writing.