diff --git a/public/components/calculators.html b/public/components/calculators.html
index 7e43ac0..2af2f1a 100644
--- a/public/components/calculators.html
+++ b/public/components/calculators.html
@@ -422,10 +422,10 @@
           <div class="card">
             <div class="card-header">
               <h3><i class="fas fa-heartbeat"></i> Normal Vital Signs by Age</h3>
-              <span style="font-size:11px;color:var(--g500);">Johns Hopkins Children's Center Kids Kard</span>
+              <span style="font-size:11px;color:var(--g500);">Harriet Lane &mdash; Johns Hopkins Children's Center Kids Kard</span>
             </div>
             <div style="padding:16px;">
-              <p style="font-size:12px;color:var(--g500);margin:0 0 14px;">Select age group to view normal vital sign ranges. Source: Johns Hopkins Children's Center Kids Kard.</p>
+              <p style="font-size:12px;color:var(--g500);margin:0 0 14px;">Select age group to view normal vital sign ranges. Source: Harriet Lane &mdash; Johns Hopkins Children's Center Kids Kard.</p>
 
               <div class="calc-field" style="max-width:300px;margin-bottom:16px;">
                 <label>Age Group</label>
diff --git a/public/js/calculators.js b/public/js/calculators.js
index a5d423d..2ece546 100644
--- a/public/js/calculators.js
+++ b/public/js/calculators.js
@@ -1609,7 +1609,7 @@
           '<div class="calc-result-item"><div class="calc-result-label">75th %ile</div><div class="calc-result-value" style="font-size:16px;color:#f97316;">' + p75.toFixed(1) + '</div><div class="calc-result-sub">High-intermediate</div></div>' +
           '<div class="calc-result-item"><div class="calc-result-label">40th %ile</div><div class="calc-result-value" style="font-size:16px;color:#f59e0b;">' + p40.toFixed(1) + '</div><div class="calc-result-sub">Low-intermediate</div></div>' +
         '</div>' +
-        '<p style="font-size:11px;color:var(--g400);margin:12px 0 0;">Bhutani hour-specific nomogram for infants &ge; 35 weeks GA. Values from Harriet Lane Handbook (Johns Hopkins Children&rsquo;s Center Kids Kard).</p>';
+        '<p style="font-size:11px;color:var(--g400);margin:12px 0 0;">Bhutani hour-specific nomogram for infants &ge; 35 weeks GA. Bhutani et al., Pediatrics 1999.</p>';
 
       // Chart: Bhutani zone curves with patient
       renderBiliChart(hours, tsb, [