Lua APA (7ú heag.)

Skinner, B. J. (1976). Earth resources (2nd ed.). Prentice-hall.

Lua i Stíl Chicago (17ú heag.)

Skinner, Brian J. Earth Resources. 2nd ed. Englewood Cliffs, N. J: Prentice-hall, 1976.

Lua MLA (9ú heag.)

Skinner, Brian J. Earth Resources. 2nd ed. Prentice-hall, 1976.

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