MARSHALL, W. (1978). Solution Of Problems Based Texbook W.t. Marshall. Pitman.
Lua i Stíl Chicago (17ú heag.)MARSHALL, W.T. Solution Of Problems Based Texbook W.t. Marshall. Pitman, 1978.
Lua MLA (8ú heag.)MARSHALL, W.T. Solution Of Problems Based Texbook W.t. Marshall. Pitman, 1978.
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