63800
His book acknowledged mathematicians such as Robert Recorde and Marcus Jordanus as well as earlier military writers on artillery such as Niccolò Tartaglia and Thomas Malthus .
 Robert Recorde, Niccolò Tartaglia, Thomas Malthus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Recorde, Niccolò Tartaglia, Thomas Malthus