Textbook font with serifs and thick, not round, commas

Stone Serif
Solved by: 
Akira Yoshino

I would be very grateful if you would please find the font shown in the picture. It is unfortunate that I could not find a higher resolution image. This is a serif font with thick, not round, commas. The second image shows the font in italics as well.

Thank you very much!


Thank you! That seems to be correct.