Pyne, S. J. (2007). Grove Karl Gilbert: A great engine of research. University of Iowa Press.
Chicago-čujuhus (17. p.)Pyne, Stephen J. Grove Karl Gilbert: A Great Engine of Research. Iowa City: University of Iowa Press, 2007.
MLA-čujuhus (9. p.)Pyne, Stephen J. Grove Karl Gilbert: A Great Engine of Research. University of Iowa Press, 2007.
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