Miller, J. Otherness. The SAGE Encyclopedia of Qualitative Research Methods. The SAGE encyclopedia of qualitative research methods. (Thousand Oaks, CA: SAGE Publications, Inc.). 2008: 588–591 [27 January 2015]. ISBN 9781412941631. doi:10.4135/9781412963909.n304. （原始内容存档于2015-11-21）.
sage-ereference.com
Miller, J. Otherness. The SAGE Encyclopedia of Qualitative Research Methods. The SAGE encyclopedia of qualitative research methods. (Thousand Oaks, CA: SAGE Publications, Inc.). 2008: 588–591 [27 January 2015]. ISBN 9781412941631. doi:10.4135/9781412963909.n304. （原始内容存档于2015-11-21）.
web.archive.org
Miller, J. Otherness. The SAGE Encyclopedia of Qualitative Research Methods. The SAGE encyclopedia of qualitative research methods. (Thousand Oaks, CA: SAGE Publications, Inc.). 2008: 588–591 [27 January 2015]. ISBN 9781412941631. doi:10.4135/9781412963909.n304. （原始内容存档于2015-11-21）.
