Levy, M. H., Back, A., Benedetti, C., Billings, J. A., Block, S., Boston, B., … Weinstein, S. M. (2009). NCCN clinical practice guidelines in oncology: palliative care. J Natl Compr Canc Netw, 7(4), 436–473. https://doi.org/10.6004/jnccn.2009.0031

Levy, Michael H., Anthony Back, Costantino Benedetti, J Andrew Billings, Susan Block, Barry Boston, Eduardo Bruera, et al. “NCCN clinical practice guidelines in oncology: palliative care.” J Natl Compr Canc Netw 7, no. 4 (April 2009): 436–73. https://doi.org/10.6004/jnccn.2009.0031.

Levy MH, Back A, Benedetti C, Billings JA, Block S, Boston B, et al. NCCN clinical practice guidelines in oncology: palliative care. J Natl Compr Canc Netw. 2009 Apr;7(4):436–73.

Levy, Michael H., et al. “NCCN clinical practice guidelines in oncology: palliative care.” J Natl Compr Canc Netw, vol. 7, no. 4, Apr. 2009, pp. 436–73. Pubmed, doi:10.6004/jnccn.2009.0031.

Levy MH, Back A, Benedetti C, Billings JA, Block S, Boston B, Bruera E, Dy S, Eberle C, Foley KM, Karver SB, Knight SJ, Misra S, Ritchie CS, Spiegel D, Sutton L, Urba S, Von Roenn JH, Weinstein SM. NCCN clinical practice guidelines in oncology: palliative care. J Natl Compr Canc Netw. 2009 Apr;7(4):436–473.