The Polykleitos reference article from the English Wikipedia on 24-Apr-2004
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Polykleitos

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There was also a less well-known sculptor named Polykleitos in the early 4th century BC.
Polykleitos (or Polycletus, Polycleitus, Polyclitus) was a Greek sculptor of the 5th century BC.

He was of the school of Argos, a contemporary of Pheidias and in the opinion of the Greeks his equal. He made a figure of an Amazon for Ephesus which was regarded as superior to the Amazon of Pheidias made at the same time; and his colossal Hera of gold and ivory which stood in the temple near Argos was considered as worthy to rank with the Zeus of Pheidias.

References

Greek works mentioning Polykleitos include: