Cita APA (7th ed.)

Mercer, D. (1998). Marketing strategy: The challenge of the external environment. Sage.

Cita Chicago (17th ed.)

Mercer, David. Marketing Strategy: The Challenge of the External Environment. London: Sage, 1998.

Cita MLA (9th ed.)

Mercer, David. Marketing Strategy: The Challenge of the External Environment. Sage, 1998.