Porter, R. I. (1977). A school course in vectors. G. Bell & Sons.
Lua i Stíl Chicago (17ú heag.)Porter, R. I. A School Course in Vectors. London: G. Bell & Sons, 1977.
Lua MLA (9ú heag.)Porter, R. I. A School Course in Vectors. G. Bell & Sons, 1977.
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