Bowen, R. (1992). Graph it !: How to make, read and interpret graphs. Prentice-Hall.
Chicago-viite (17. p.)Bowen, Rich. Graph It !: How to Make, Read and Interpret Graphs. Englewood Cliffs, N.J: Prentice-Hall, 1992.
MLA-viite (9. p.)Bowen, Rich. Graph It !: How to Make, Read and Interpret Graphs. Prentice-Hall, 1992.
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