Why isn't there a period after "Hart specialized in regret"?

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The Gerald Nachman quote seems to be lacking a period after the word "regret" here:

: Typical of Hart at his most moody but perceptive is "Spring Is Here," a love song about love's absence. Hart specialized in regret His words assume a musing mood that questions the promised springtime romance of banal ballads, Hart's glum verse contradicting Rodgers' lush melody:

But I can't access the source to know if it is deliberately missing a period or not. Em3rgent0rdr (talk) 17:12, 15 March 2024 (UTC)Reply