Probably the best English source is Leonard Oschry's translation of the
Chafetz Chaim's sefer Ahavas Chesed (printed by Feldheim). In section 3
chapter 3 the Chafetz Chaim discusses the mitzva of bikur cholim in full.
You might also want to check out a translated Kitzur Shulchan Aruch
section 193.
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